What is the difference between the following two instructions:

(1) j Calc

(2) jal Calc

Answers:	the "jal Calc" instruction first stores the current value of the PC to $ra, then jumps to label "Calc"
	there is no difference in what these two instructions do
	the "jal Calc" instruction first pushes the return address to the stack, then jumps to label "Calc"
	the "jal Calc" instruction first copies the return address $ra to PC, then jumps to label "Calc"

Which statement about the following code is most accurate?

lw $a0, n

jal my_function

Answers:	the code places data needed by my_function in the $a0 register in order to follow the argument convention in MIPS function calls
	the code sends $a0 to my_function
	none of these is accurate
	the lw instruction loads the contents of memory location n into $a0 before the jal instruction