What is the product?
$3 \cdot\left[\begin{array}{llll}
1 & -4 & 5 & -7
\end{array}\right]$
A$\left[\begin{array}{llll}3 & -12 & 15 & -21\end{array}\right]$
B$\left[\begin{array}{llll}4 & -1 & 8 & -4\end{array}\right]$
C$\left[\begin{array}{llll}3 & 12 & 15 & 21\end{array}\right]$
D$\left[\begin{array}{llll}4 & -12 & 8 & -21\end{array}\right]$
$3 \cdot\left[\begin{array}{llll}
1 & -4 & 5 & -7
\end{array}\right]$
A$\left[\begin{array}{llll}3 & -12 & 15 & -21\end{array}\right]$
B$\left[\begin{array}{llll}4 & -1 & 8 & -4\end{array}\right]$
C$\left[\begin{array}{llll}3 & 12 & 15 & 21\end{array}\right]$
D$\left[\begin{array}{llll}4 & -12 & 8 & -21\end{array}\right]$