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of An investment broker wants to invest up to $40,000. She can purchase a type X bond yielding a 12% return on the amount invested, and she can purchase a type Y bond yielding a 18% return on the amount invested. She wanted to invest at least as much in type A bond as in the type B bond. She will also invest at least $10,000 in type A bond and no more than $10,000 in type B bond. How much should she invest in each type of bond to maximize her return? Select one: O a. X = $30000, Y = $10000 O b. X = $ 10000, Y = $30000 Oc. X = $18000, Y = $12000 Od X = $12000, Y = $18000