Rewrite the second$-$order differential equation: $y^{\text{'}\text{'}}-y^{\text{'}}cosx+x^{2}y=0$ as a linear system of first order differential equations.

a$)\left[\begin{array}{c}{y}^{\text{'}}\\ u^{\text{'}}\end{array}\right]=\left[\begin{array}{cc}0& 1\\ x^2& -cosx\end{array}\right]\left[\begin{array}{c}y\\ u\end{array}\right]$

c$)\left[\begin{array}{c}{y}^{\text{'}}\\ u^{\text{'}}\end{array}\right]=\left[\begin{array}{cc}1& 0\\ x^2& -cosx\end{array}\right]\left[\begin{array}{c}y\\ u\end{array}\right]$

b$)\left[\begin{array}{c}{y}^{\text{'}}\\ u^{\text{'}}\end{array}\right]=\left[\begin{array}{cc}0& 1\\ -x^2& cosx\end{array}\right]\left[\begin{array}{c}y\\ u\end{array}\right]$

d$)\left[\begin{array}{c}{y}^{\text{'}}\\ u^{\text{'}}\end{array}\right]=\left[\begin{array}{cc}1& 0\\ -x^2& cosx\end{array}\right]\left[\begin{array}{c}y\\ u\end{array}\right]$