The constraints of a problem are graphed. What are the vertices of the feasible region?
A
open paren 0 comma 0 close paren , open paren 0 comma 40 close paren , open paren 25 comma 20 close paren , open paren 15 comma 0 close parenB
open paren 0 comma 40 close paren , open paren 25 comma 20 close paren , open paren 15 comma 0 close parenC
open paren 0 comma 0 close paren , open paren 0 comma 15 close paren , open paren 20 comma 25 close paren , open paren 40 comma 0 close parenD
open paren 0 comma 15 close paren , open paren 20 comma 25 close paren , open paren 40 comma 0 close paren