if 6412 = 2a-3, what is the value of a?

if 64¹² = 2^a-3, what is the value of a?

A 15

B 69

C 72

D 75

Correct Answer: Option D

6412 = 2a-3 or,(26)12 =2a-3 or,272=2a-3 or, 72=a-3 so,a=72+3 so,a = 75 the value of a = 75