What does the sign mean?

1. AAhead of you is a merge with a road from the left. Give right of way and do not turn left.
2. BThere is an obligation to stop in any case and to give right of way to the traffic merging from the right.
3. CT-junction. Turning onto the side road is permitted.
4. DAhead of you is a dead-end road. Entry into this road is forbidden.

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