Differentiate between ‘by’ and ‘until’ in the context of prepositions of time.

A. The preposition ‘by’ indicates a starting time, while ‘until’ indicates an ending time.

B. By and until are interchangeable in the context of prepositions of time.

C. The preposition ‘by’ indicates a deadline or the latest time something should be done, while ‘until’ indicates the time up to which an action or event will happen.

D. By is used for past events, while until is used for future events.