Only track Ա is allowed. Track Բ passes directly over the pedestrian crossing marked by signs 5.19.1 and 5.19.2, where the Rules prohibit a U-turn (clause 50). Track Ա is correct, because the U-turn is made within the intersection. The 5.7.2 “Exit onto a one-way road” sign shows that traffic on the crossing road moves to the left, so you may not turn right there, but it does not prohibit a U-turn.
Option 2. Track Բ is prohibited, because a U-turn is prohibited on pedestrian crossings. Option 3. You may not use track Բ, because the law prohibits a U-turn on pedestrian crossings.