A firm pays each worker (i.e. each unit of labour L ) a wage w = 4 and pays for each computer (ie each unit of capital K ) a cost of r = 3. The firm has a production function Y = K . 2L and needs to produce Y = 12 . Which of the following is correct? Select one answer: O The firm employs 12 workers and buys no computers O The firm employs 6 workers and buys no computers O The firm buys 12 computers and hires no workers O The firm buys 6 computers and hires no workers