Is it mandatory to obey a policeman's instructions, even when the instruction or signal contradicts the road signs?

1. ANo, there is no obligation to obey.
2. BYes, it is mandatory to obey, and with great care.
3. CYes, except for an instruction that contradicts the "No Entry" sign.
4. DYes, except for an instruction that contradicts the "Stop" sign.

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