Correct answer
Making a U-turn.
The picture shows R-304, which prohibits a U-turn. It is not a reversing prohibition or, by itself, a ban on turning left. Those other manoeuvres remain subject to their own applicable rules and signs; R-304 does not mean that they are always permitted. It does not itself impose a continuing ban until an end sign.
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Reversing.
Turning left.
Making a U-turn.
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Sign R-304: no u-turn
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