Refer to the exhibit.

Which links can be combined in the same link aggregation?
Refer to the exhibit.
Which links can be combined in the same link aggregation?
For link aggregation to be possible, the links need to connect the same pair of devices. When connecting switches, link aggregation can only be formed by links connecting the same pair of switches. Here, Links 3 and 4 connect Switch-1 to Switch-3 and Switch-4, respectively, so they can't be aggregated. Links 3 and 5 connect Switch-3 to Switch-1 and Switch-4, respectively, and they can be aggregated.
a is correct.