Answer:
The correct answer would be G₀ phase.
G₀ or resting phase or quiescent phase is a phase in which cell exists a cell cycle.
It is the phase in which a cell is neither dividing nor preparing for the cell division.
The cell after completing the M phase or mitotic division enters the G₀ phases if it is not going for another round of cell division.
A cell matures, differentiate and remains metabolically active in G₀ phase.