Refer to the exhibit. An administrator must connect SW_1 and the printer to the network. SW_2 requires DTP to be used for the connection to SW_1. The printer is configured as an access port with VLAN

`switchport mode dynamic auto` (and D) makes the port passively wait to form a trunk. If SW1 is also in auto mode or access mode, a trunk will not form, failing to meet the requirement for DTP to be used for the connection.

`switchport mode trunk` forces the interface into unconditional trunking, which uses DTP to negotiate trunking parameters but doesn't actively 'require' DTP for the connection in the sense of initiating the trunk negotiation, especially if the other side is not compatible. The question implies active DTP negotiation is needed.

Configuring `switchport mode dynamic desirable` on SW2's interface connecting to SW1 causes the port to actively attempt to convert the link to a trunking link using DTP. This ensures DTP is actively used for negotiation, and a trunk will form if SW1 is also configured for trunking or in dynamic auto/desirable mode.

`switchport mode dynamic auto` (same as A) makes the port passively wait to form a trunk. If SW1 is also in auto mode or access mode, a trunk will not form, failing to meet the requirement for DTP to be used for the connection.