Two heaters designed for the same voltage `V` have different power ratings. When connected individually across as source of voltage` V`, they produce `H` amount of heat each in time `t_1` and `t_2` respectively. When used together acros the same source, they produce H amount of heat in time t

Options

A. If they are in series,` t=t_(1)+t_(2)`
B. If they are in series, `t=2(t_(1)+t_(2))`
C. If they are in parallel, `t=(t_(1)t_(2))/((t_(1)+t_(2)))`
D. If they are in paralle, `t=(t_(1)t_(2))/(2(t_(1)+t_(2)))`