A mutual fund manager must decide how much money to invest in Atlantic Oil (A) and how much to invest in Pacific Oil (P). At least 60% of the money invested in the two oil companies must be in Pacific Oil. A correct modeling of this constraint is a. 0.6A + 0.4P >= 0 b. -0.6A + 0.4P >= 0 c. -0.4A + 0.6P >= 0 d. 0.4A + 0.6P >= 0