About Overtaking: the F1 sign and the five exceptions to left-overtaking: which statement is correct?

Overtaking on the right is allowed only when the driver on your left signals or positions to turn left; there are no other cases.
The 'no overtaking' sign (F1) is a round sign with a BLUE background.
Overtaking on the right is only allowed with stationary or slow-moving traffic, such as in a traffic jam.
✓ F1 prohibits motor vehicles from overtaking EACH OTHER; agricultural vehicles may still be overtaken at this sign.

Correct answer: F1 prohibits motor vehicles from overtaking EACH OTHER; agricultural vehicles may still be overtaken at this sign.

Explanation

F1 prohibits motor vehicles from overtaking EACH OTHER; agricultural vehicles may still be overtaken at this sign

Overtaking on the right is allowed in more cases: just before and on a roundabout, right of block marking, in a queue and past a driver positioned to turn left
The icon is unambiguously a RED border on a WHITE background, with a black car overtaking a red car. Red border = prohibition sign, like the rest of the F-series (F1-F4)
There are FIVE exceptions: right before/at roundabouts, driving to the right of a block marking, overtaking a traffic jam, a driver who has signalled left and pre-sorted left, and overtaking a tram. The traffic jam is only one of them