Find a Matrix a and a Column Matrix B That $$\mathrm { AB } = \left[ \begin{array} { r } 1279 \\1194 \\939\end{array} \right]$$

Find a matrix A and a column matrix B that describe the following tables involving credits and tuition costs. Find the
matrix product AB, and interpret the significance of the entries of this product.
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A)
$$\mathrm { AB } = \left[ \begin{array} { r } 1279 \\1194 \\939\end{array} \right]$$
Tuition for Student 1 is $\$ 1279$ , tuition for Student 2 is $\$ 1194$ , and tuition for Student 3 is $\$ 939$ .
B)
$$\mathrm { AB } = \left[ \begin{array} { r } 1272 \\1196 \\925\end{array} \right]$$
Tuition for Student 1 is $\$ 1272$ , tuition for Student 2 is $\$ 1196$ , and tuition for Student 3 is $\$ 925$ .
C)
$$\mathrm { AB } = [ 3739 ]$$
The total tuition paid by all 3 students is $\$ 3739$ .
D)
$$\mathrm { AB } = [ 3588 ]$$
The total tuition paid by all 3 students is $\$ 3588$ .