Two heaters designed for the same voltage V have different power ratings. When connected individually across a source of voltage (V ), they produce H amount of heat each in times ( t ₁ ) and ( t ₂ ) respectively. When used together across the same source, they produce H amount of heat in time (t ). Then correct option is (a) If they are in series, (t=t₁+t₂ ) (b) If they are in series, (t=2 (t₁+t₂ ) ) (c) If they are