Find the indefinite integral: integral e to the power of x square root of 5 e to the power of x plus 4 end root space d x a.) 2 over 15 e to the power of x left parenthesis 5 e to the power of x plus 4 right parenthesis to the power of 3 over 2 end exponent plus c b.) 2 over 15 left parenthesis 5 e to the power of x plus 4 right parenthesis to the power of 3 over 2 end exponent plus c c.) 3 over 10 e to the power of x left parenthesis 5 e to the power of x plus 4 right parenthesis to the power of 3 over 2 end exponent plus c d.) 3 over 10 left parenthesis 5 e to the power of x plus 4 right parenthesis to the power of 3 over 2 end exponent plus c