Many new types of interlocking home signals are equipped with route request buttons. When the button is operated and a light goes on over the button to show the train operator's request has registered in the tower. The tower operator acknowledges the request by either changing the route or canceling the light. If a train operator pulls up to a signal indicating a wrong route and operates the route request button and receives no acknowledgement from the tower operator, it would be improper for the train operator to:
a. Accept that the route is set up and report it later at the nearest dispatcher's office.
b. Assume there is a communication error and proceed as usual.
c. Wait indefinitely until the tower operator responds.
d. Manually override the signal and proceed.