Which correction must architect make to the proposal to meet the customer requirements?

Refer to the exhibits.

Exhibit 1. Existing wiring plan:

Exhibit 2. Current proposal:

A customer has a building that needs a switch upgrade. The customer would like at least 20Gbps for the uplink bandwidth out of each closet. The building writing plan is shown in Exhibit 1. The customer will not consider any cable upgrades at this point. The current proposal is shown in Exhibit 2.

Which correction must architect make to the proposal to meet the customer requirements?
A . Change the SR transceivers for each link between the writing closet switches and the network core to LRM transceivers.
B . Add an aggregation layer, and connect writing closet switches to the aggregation layer on Smart Rate ports.
C . Add an aggregation layer, and connect writing closet switches to the aggregation layer with SFP+ SR transceivers.
D . Add a mode conditioning cable for each link between the writing closet switches and the network core.

Answer: D