Which of the following statements is true regarding S$-$VLAN policy?

$1.$S$-$VLAN policy with a subscriber$-$parent keyword is supported on both ingress and egress directions.

$2.$S$-$VLAN policy with a subscriber$-$parent keyword is supported only on ingress directions.

$3.$S$-$VLAN policy with a subscriber$-$parent keyword is supported only on egress directions.!!!!!!!!!!!!!!!

$4.$S$-$VLAN policy with a subscriber$-$parent keyword is not supported on both ingress and egress directions.