Let \int e ^ { x } \{ f ( x ) - f' ( x ) \} d x = \ϕ ( x ) Then \int e ^ { x } f ( x ) d x is

Correct Answer is : 12{ϕ(x)+exf(x)}

1/2\{\ϕ ( x ) + e ^ { x } f ( x )\}

1/2\{\ϕ ( x ) - e ^ { x } f ( x )\}