$[13]$ The CAR larr SBR is executed to:

a$)$ Call a subroutine

b$)$ Return from a subroutine

c$)$ Map from bits of instruction to address for control memory

d$)$ Unconditional or conditional branch

[13] The CAR SBR is executed to: a) Call a subroutine b) Return from a subroutine c) Map from bits of instruction to address for control memory d) Unconditional or conditional branch