The network administrator is configuring Unidirectional Link Detection (UDLD) on trk1 on an HP Provision
witch. The trk1 link aggregation group has these settings:
Interfaces = 48 and 49
Untagged VLAN = 1
Tagged VLANs = 2-4
How should the administrator complete the setup?

A.
Enable link-keepalive on both interfaces in the trunk (48 and 49).

B.
Enable link-keepalive on interface 48, specifying the VLAN as 1.

C.
On both interfaces in the trunk (48 and 49), enable link-keepalive, specifying the VLAN as 1.

D.
Enable link-keepalive on trk1

Explanation:
* The following commands allow you to configure UDLD via the CLI.
Syntax: [no] interface <port-list> link-keepalive
Enables UDLD on a port or range of ports
* Ports enabled for UDLD exchange health-check packets once every five seconds (the link-keepalive interval).
If a port does not receive a health-check packet from the port at the other end of the link within the keepalive
interval, the port waits for four more intervals. If the port still does not receive a healthcheck packet after waiting
for five intervals, the port concludes that the link has failed and blocks the UDLD-enabled port.Reference: Port Status and Basic Configuration
ftp://ftp.hp.com/pub/networking/software/2900yl-MCG-0207-T_12_XX-Chap10-PrtStat-BasicCfg.pdf