Which of the following can be used by router R4 in AS 65542 to reject all routes originating in AS 65540?

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Which of the following can be used by router R4 in AS 65542 to reject all routes originating in AS 65540?
A . An import policy that rejects updates with an AS Path matching the regular expression ".+ 65540 .+".
B . An import policy that rejects updates with an AS Path matching the regular expression ".+ 65540".
C . An import policy that rejects updates with an AS Path matching the regular expression "65540 .+".
D . An import policy that rejects updates with an AS Path matching the regular expression "65540".

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Answer: B