Which command on an EX Series switch allows for the configuration of the duplex setting on multiple interfaces at the same time?

Which command on an EX Series switch allows for the configuration of the duplex setting on multiple interfaces at the same time?

A.
interface-range

B.
apply-path

C.
interface-group

D.
port-range

Explanation:
Interface-range:

The JUNOS Software allows you to group a range of identical interfaces into an interface range. You first specify the group of identical interfaces in the interface range.
Then you can apply a common configuration to the specified interface range, reducing the number of configuration statements required and saving time while producing a compact configuration.

Example: Interface Range Common Configuration

Configuration common to an interface range can be added as a part of the interface-range definition, as follows:

[edit]
interfaces {
+ interface-range foo {
+ member-range ge-1/0/0 to ge-4/0/40;
+ member ge-0/1/1;
+ member ge-5/[1-10]/*;
/*Common config is added as part of interface-range definition*/
mtu 256;
hold-time up 10;
ether-options {
flow-control;
speed {
100m;
}
802.3ad primary;
}
}
}

An interface-range definition having just member or member-range statements and no common configurations statements is valid.

These defined interface ranges can be used in other configuration hierarchies, in places where an interface node exists.