Which of the following expressions is/are equivalent to 1/12 x 36^t? There may be more than one correct answer. Select all that apply.

a) 1/2 x 6 x 36^t
b) 1/2 x 6^-1 x 36^t
c) 1/2 x 6^2t-1
d) (2^-1)^2 x 3^2t-1
e) 2^2t-1 x 3^2t-1