According to GCOR, what is the indication for a signal displaying a single yellow light, known as an 'Approach' signal?
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A
Proceed at restricted speed.
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B
Proceed prepared to stop at the next signal. Trains exceeding 30 MPH must immediately reduce to that speed.
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C
Stop, then proceed at restricted speed.
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D
Proceed, but be prepared to pass the next signal at a speed not exceeding 40 MPH.