$A=\left[\begin{array}{rr}2 & 0 \\0 & -3\end{array}\right]$ এবং $B=\left[\begin{array}{ll}3 & 0 \\5 & 1\end{array}\right]$ হলে $AB$ এর মান কত ?

$\left[\begin{array}{rr}6 & 0 \\-15 & -3\end{array}\right]$

$\left[\begin{array}{ll}3 & -1 \\2 & -5\end{array}\right]$

$\left[\begin{array}{cc}1 & 0 \\-2 & 15\end{array}\right]$

$\left[\begin{array}{rr}1 & -2 \\0 & 5\end{array}\right]$