Charges `Q_1 and Q_2` lie inside and outside, respectively, of a closed surface S. Let E be the field at any point on S and `phi` be the flux of E over S.

Options

A. If `Q_(1)` changes, both E and `phi` will change
B. If `Q_(2)` changes, E will change but `phi` will not change
C. If `Q_(1) = 0` and `Q_(2) != 0` then `E != 0` but `phi = 0`
D. If `Q_(1) != 0` and `Q_(2) = 0` then `E = 0` but `phi != 0`