Solving it on a paper would be great thanks

Given the following $3-$bit register that is designed using T$-$FFs and MUXs. If the select lines are $S_1{S}_0=01,$ what is the function the register performs?

a$)$ No change

b$)$ Shift left

c$)$ Shift right

d$)$ Load all Flip$-$flops with ones $(111)$