What is the significance of the preamble?

A. The preamble allows the switch to allocate a buffer.
B. The preamble allows the switch to sense collisions before data is transmitted.
C. The preamble allows the switch to sync timing for the receipt of information to follow.
D. The preamble allows the switch to read the sequence and acknowledge receipt of the frame.

C. The preamble allows for the source computer to sync its timing of the physical media independent interface with the destination computer. It achieves this via an alternating 1 and 0 pattern at a specific frequency, depending on data transfer speed. The Start Frame Delimiter (SFD) has an extra bit to let the destination computer know anything that follows is data.