Which command prevents Layer 2 loops if the switch stops receiving spanning-tree keepalives on port ge-1/0/1?

A.
[edit protocols rstp]
user@switch# show
interface ge-1/0/1 {
bpdu-block;
}

B.
[edit protocols layer2-control]
user@switch# show
interface ge-1/0/1 {
bpdu-time-out-action {
block;
alarm;
}
}

C.
[edit protocols layer2-control]
user@switch# show
bpdu-block {
interface ge-1/0/1;
}