Tanner Tavern writes four checks a day for an average amount of $5,400 each. These checks generally clear the bank four days after they are written. In addition, the firm generally receives and deposits checks amounting to $18,700 each day. All deposits are available on the next day. What is the firm's net float?

a) Net disbursement float of $67,700

b) Net disbursement float of $86,400

c) Net collection float of $13,200

d) Net collection float of $22,300