Consider the differential equation $y^{\text{'}\text{'}}+3y^{\text{'}}-4y=x+4e^x.$

Using the method of undetermined coefficients, which of the following would be the best choice for a general form for the particular solution, $y_p?$

$y_p=Ax+Bx{e}^x$

$y_p=Ax+B+Cx{e}^x$

$y_p=Ax+B{e}^x$

$y_p=Ax+B+C{e}^x$