The seven$-$person maintenance function at a hospital performs both preventive and corrective maintenance on hundreds of items each month. All the workers are scheduled for $40$ hours per week and there are four weeks in a month. It is the goal of the maintenance department to achieve $90\%$ utilization with a mix of two$-$thirds preventive maintenance and one$-$third corrective maintenance. How many hours each month are spent performing preventive maintenance if they achieve their $90\%$ utilization and correct$/$preventive mix targets?

Group of answer choices

$672$ hours

$336$ hours

$1,008$ hours

$1,120$ hours

None of the above