You must come back by two o'clock

[hirashin]

Dear native English speakers.
Which would be used?
(a) You must come back by two o'clock.
(b) You must be back by two o'clock.
(c) You must come back before two o'clock.
(d) You must be back before two o'clock.

Hirashin

 

[WonkoTheSane]

All seem equally likely to me.

 

[hirashin]

Thanks< Wonko. Would "You must get back by/before two o'clock." be different?

 

[WonkoTheSane]

Thanks< Wonko. Would "You must get back by/before two o'clock." be different?

Nope, same concept.

 

[hirashin]

Thanks, Wonko.