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Question $1$$\newline$$1$ point$\newline$Which of the following must be true before two matrices $A$ and $B$ can be multiplied?$\newline$The number of rows in $A=$ The number of rows in $B$$\newline$The number of columns in $A=$ The number of rows in $B$$\newline$The number of rows in $A=$ The number of columns in $B$$\newline$The number of columns in $A=$ The number of columns in $B$