Question $22($Mandatory$)(2$ points$)$

Sally sells $40$ bags of lettuce for a total of $\backslash (\backslash$$ $80\backslash )$ at the farmers' market.a$)$ The $\backslash (\backslash$$ $80\backslash )$ is a real variable. The quantity of lettuce is a nominal v$$riable$.$b$)$ The $\backslash (\backslash$$ $80\backslash )$ is a nominal variable. The quantity of lettuce is a real variable.c$)$ Both the $\backslash (\backslash$$ $80\backslash )$ and the quantity of lettuce are nominal variables.d$)$ Both the $580$ and the quantity of lettuce are real variables.