Refer to the IOS configuration in the exhibit. How will the next incoming call be routed?

dial-peer voice 1 pots
translation-profile incoming in1

trunk group 101
carrier-id 1642
hunt-scheme sequential even up
translation-profile incoming in1

controller T1 1/0
ds0-group 1 timeslots 1-24 type e&m-fgd
cas-custom 1
trunk-group 101

voice-port 1/0
translation-profile incoming in1
trunk-group 101 1

voice service pots
translation-profile incoming controller T1 1/0 in1

A.
The call will be routed to the longest idle channel.

B.
The call will be routed to the least used channel.

C.
The call will be routed to a random available channel.

D.
The call will be routed to the next available channel, starting from channel 1, hunting up toward channel

E.
The call will be routed to the next available channel, starting from channel 24, hunting down toward channel 1.

Explanation:
In the configuration, we learn that the hunt-scheme sequential is used. It specifies the sequential search method for finding an available channel in a trunk group for outgoing calls. The syntax of this command is shown below:

hunt-scheme sequential [both | even | odd [up | down] ]

Description:

+ both: Searches both even and odd numbered channels.
+ even: Searches for an idle even numbered channel. If no idle even numbered channel is available, an odd-numbered channel is sought.
+ odd: Searches for an idle odd numbered channel. If no idle odd numbered channel is available, an even-numbered channel is sought.

+ up: Searches channels in ascending order based within a trunk group member.
+ down: Searches channels in descending order within a trunk group member.

Notice that up & down parameters are used with both, even or odd.

Therefore the command hunt-scheme sequential even up searches in ascending order for an even numbered idle channel starting with the trunk group member of highest precedence. I am not so sure but channel 24 will have highest precedence so the hunt begins from channel 24 down to channel 1. Therefore, E is the most suitable solution for this question.

The cas-custom command is used to customize T1/CAS signaling parameters for a particular T1 channel group on a channelized T1 line.