Help me choose the correct answers, the question 7 that I chose can be wrong. Thanks a lot.

Question 7 4 pts Economic profit enables a firm to (O maximize revenues. O serve customers the firm''s way. (O obtain profit while being inefficient. (O not include opportunity cost to complicate calculations. (@ maximize profit and minimize costs. Accounting profit is the optimum variable to use to determine profit maximizing decisions. O True O False Variable costs (O are the costs of inputs that vary with output such as natural resources. (O are the costs of inputs that do not vary with output such as capital resources. (O are only explicit costs. O are only implicit costs. O all of the above are correct. Question 10 4 pts Fixed costs (O are the costs of inputs that vary with output such as natural resources. (O are the costs of inputs that do not vary with output such as capital resources. (O are only explicit costs. (O are only implicit costs. O all of the above are correct