Hi Tutors, I need help for the Employment Law

Questions:

Are the below situations Discrimination (as per the OntarioHRC?) If yes, on what Prohibited Ground? Is it Direct or Indirect (Constructive/Adverse Effect) Discrimination?

a) A rule/requirement to wear safety masks in hospital - men must be clean-shaven in order to wear masks.

b) All delivery personnel are required as part of uniform to wear flattering brown shorts, knee socks and dress shoes.

c) All workers must wear hardhats on work site.

d) Waitresses needed.

e) All applicants must be over 18

f) All applicants must be Canadian citizens or landed immigrants.

g) No fatties need apply.

h) Preference will be given to Native persons and others who have been historically disadvantaged.

i) Have you ever been convicted of a criminal offence?

j) Applicants must be practicing Christian single heterosexual males.