Question: RARS when run in 6 4 - bit mode has 6 4 - bit registers. But it is limited to using 3 2 - bit

RARS when run in 64-bit mode has 64-bit registers. But it is limited to using 32-bit pointers. Say register s1 contains a pointer and its value has been saved on the stack. When restoring the pointer back to register s1 which of these instructions would be safer to use (and do you know why?):
Group of answer choices
lw s1,0(sp)
lwu s1,0(sp)

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