Which of the following syscall is used to read an integer?

A、li
$v0, 1


add $a0, $t0, $zero
syscall;

B、li
$v0, 4


add $a0, $t0, $zero
syscall;

C、li
$v0, 5


add $a0, $t0, $zero
syscall;

D、li
$v0, 8


add $a0, $t0, $zero
syscall