A bidirectional enhancer has the following sequence:

5′–GTCA–3′

3′–CAGT–5′

Which of the following sequences would also be a functional enhancer?

a. 5′–ACTG–3′

3′–TGAC–5′

b. 5′–TGAC–3′

3′–ACTG–5′

c. 3′–GTCA–5′

5′–CAGT–3′

d. 3′–TGAC–5′

5′–ACTG–3′