Many jazz tunes use the rhythm changes harmonic progression as a base template (cf. inf. for examples). The B section is a playground for different[^jg] reharmonizations.
Audio example of the 3 options preceded by 4 bars over Bb6:
This is a variation of the blues turnaround memorization exercise. Options a, b or c will be repeated twice. This allows the student to hear the progression once and then repeat it or, at a later stage, play each option two times.