Question $7$

$0\mathrm{.}1$ pts

What does the following instruction do$?$

push $ St $7$

It increments $$sp$ by $4,$ then copies the value of $$t7$ to the previous address of $$sp.$

It decrements $$sp$ by $4,$ then copies the value of $$t7$ to the previous address of $$sp.$

It increments $$sp$ by $4$ and then copies the value of $$t7$ to the current address of $$sp.$

It decrements $$sp$ by $4$ and then copies the value of $$t7$ to the current address of $$sp.$