Which statement is true regarding STP?

Which statement is true regarding STP?
A . When the spanning-tree topology is calculated based on default parameters, the path between the source and destination end stations in a switched network might not be ideal.
B . The path between the source and the destination end stations is always ideal with the default spanning-tree parameter.
C . The path between the source and the destination end stations is determined by the speed of the link; the slowest link speed will become the root port during the election.
D . The path between the source and the destination end stations is determined by the lowest MAC address; the lowest MAC address will become the root port during the election.

Answer: A