Differentiating Names of Persons: Questions

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According to RDA: Additions to the name are given as instructed under 9.19.1.2–9.19.1.6

•9.19.1.2 (9.4 and 9.6): Title or other designation associated with the person
–Required for certain names

•9.19.1.3 (9.3.2/9.3.3): Date of birth and/or death
–Give if available

•9.19.1.4 (9.5): Fuller form of name
–Add to differentiate (LC!)

•9.19.1.5 (9.3.4): Period of activity of person
–Add to differentiate

•9.19.1.6 (9.16): Profession or occupation
–Required for certain names; Can add to differentiate


QUESTION: Can we still use qualifiers to 100 field according to MARC X00 - Personal Names-General Information to differentialte in Name Authority Records of different persons with same name
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http://www.loc.gov/marc/authority/adx00.html

can we use qualifier in subfield $c which is defined as:

$c - Titles and other words associated with a name
Includes qualifying information such as
•titles designating rank, office, or nobility, e.g., Sir
•terms of address, e.g., Mrs.
•initials of an academic degree or denoting membership in an organization, e.g., F.L.A.
•a roman numeral used with a surname
•other words or phrases associated with the name, e.g., clockmaker, Saint.
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Please note

RDA Rule 9.19.1.2 Title or Other Designation Associated with the Person
Add to the name one or more of the following elements (in this order), as applicable:
a)a title of royalty (see 9.4.1.4) or nobility (see 9.4.1.5)
b)the term Saint (see 9.6.1.4)
c)title of religious rank (see 9.4.1.6–9.4.1.8)
d)the term Spirit (see 9.6.1.5)
e)the profession or occupation (see 9.16) for a person whose name consists of a phrase or appellation not conveying the idea of a person.

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EXAMPLES OF SITUATIONS : suppose there is an NAR already established as [100-1- Haider, Salman]. Now while cataloging we come across a different person named as "Salman Haider"

Question 1: Can we use Dr. in subfield c to differentiate NAR. (e.g. only information available on the resource Dr. Salman Haider ; no other information available on the resource or on the web)
Question 2: Can we use Ph. D. in subfield to differentiate NAR (e.g. only information available on the resource Salman Haider, Ph. D. ; no other information available on the resource or on the web)
Question 3: Can we use period of activity of the person belonging to 20th/21st century in subfield to differentiate NAR (e.g. only information available on the resource Salman Haider ; no other information available on the resource or on the web)