During which phase(s) of cell cycle, amount of DNA in a cell remains at 4 C level

During which phase(s) of cell cycle, amount of DNA in a cell remains at 4 C level if the initial amount is denoted as 2C ?

(a) G0 and G1
(b) G1 and S
(c) Only G2
(d) G2 and M

Only G2

In M-phase both 4C and 2C of DNA are present in different stages.

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