Shape of a Product and the Entry at Row 2, Column 3

Two matrices are given:

$A = \begin{bmatrix} 2 & -1 \\ 0 & 3 \\ 4 & 5 \end{bmatrix}, \qquad B = \begin{bmatrix} 1 & 2 & 0 & -3 \\ 4 & -1 & 5 & 2 \end{bmatrix}$

The product $AB$ is formed. Write $(AB)_{ij}$ for the entry sitting in row $i$, column $j$ of the result, with rows and columns counted from 1.

What is the shape of $AB$, and what is the value of $(AB)_{23}$?