Let xij $=$ gallons of component i used in gasoline j$.$ Assume that we have two components and two types of gasoline. There are $8000$ gallons of component $1$ available, and the demand gasoline types $1$ and $2$ are $11,000$ and $14,000$ gallons, respectively. Write the demand constraint for gasoline type $1.$

Group of answer choices

x$21+$ x$22=11000$

x$12+$ x$22=11000$

x$11+$ x$21<=11000$

x$11+$ x$21=11000$