Dear teachers,
I get confused if all of the following sentences a) through d) could be gmmatically correct or not.
Original sentences before parallel structure are:
1. Use the present perfect tense.
2. Use the past perfect tense.
In parallel structure:
a) Use the present and past perfect tenses.
(This is probablly the best, isn't it?)
b) Use the present perfect and the past perfect tense.
(Is it grammatially okay?)
c) Use the present perfect and past perfect tenses.
(How about this??)
d) Use the present and the past perfect tense.
(Is it also grammatically okay?)
Native speakers, please, please help me

!!!