If a switch port receives a new frame while it is actively transmitting a previous frame, how does it process the frames?

If a switch port receives a new frame while it is actively transmitting a previous frame, how does it process the frames?
A . The new frame is delivered first, the previous frame is dropped, and a retransmission request is sent
B . The previous frame is delivered, the new frame is dropped, and a retransmission request is sent
C . The new frame is placed in a queue for transmission after the previous frame
D . The two frames are processed and delivered at the same time

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Answer: C