The coefficient of \( x^{101} \) in the expression \( (5 + x)^{500} + x(5 + x)^{499} + x^{2}(5 + x)^{498} + \ldots + x^{500}, \, x > 0, \) is
${}^{501}C_{101}(5)^{399}$
${}^{501}C_{101}(5)^{400}$
${}^{501}C_{100}(5)^{400}$
${}^{500}C_{101}(5)^{399}$