through $($c$)$ below.

a$.$ What physical interpretation can be given to the vector $3v_1?$

A$.$ It is the output of copper at mine #$1$ after $3$ days of operation.

B$.$ It is the output at mine #$2$ after $3$ days of operation.

C$.$ It is the output at mine #$1$ after $3$ days of operation.

D$.$ It is the output of silver at mine #$1$ after $3$ days of operation. produce $369$ tons of copper and $3726$ kilograms of silver. Do not solve the equation.

$v_1+v_2=$

$($Type an integer or decimal for each matrix element.$)$