The company produces $3$ different products. If Xab $=$ the production of product a in period b$,$ then to indicate that the limit on production of the company's $3$ products in period $1$ is $350,$ we write:

Group of answer choices

X$32$

$350$

X$11+$ X$21+$ X$31$

$350$

X$12+$ X$22+$ X$32$

$350$

X$31+$ X$32+$ X$33$

$350$

None of the above