For MIPS CPU, if register $$t1$ holds $2000$ and register $$t2$ holds $4000,$ then which of the following is a load instruction that loads register $$t3$ with the data stored at memory address $4000$

Iw $t$3,$ $t$1$

Iw $t$3,$ $t$2$

Iw $t$3,$ O$($$t$1)$

$lw$$$t3,O($$$t2)$