Which configuration summarizes external routes in the 172.16.0.0/22 range into a single prefix on an ABR for Area 1?

Which configuration summarizes external routes in the 172.16.0.0/22 range into a single prefix on
an ABR for Area 1?

Which configuration summarizes external routes in the 172.16.0.0/22 range into a single prefix on
an ABR for Area 1?

A.
protocols {
ospf {
area 0.0.0.1 {
nssa {
default-lsa {
default-metric 1;
metric-type 1;
}
area-range 172.16.0.0/22;
}

B.
protocols {
ospf {
area 0.0.0.1 {
nssa {
area-range 172.16.0.0/22;
}

C.
protocols {
ospf {
area 0.0.0.1 {
stub summaries;
}

D.
protocols {
ospf {
area 0.0.0.1 {
nssa;
area-range 172.16.0.0/22 restrict;
}



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