Edith purchases a television set from Big Al$$s Electronic Emporium, agreeing to pay Big Al in monthly installments on a $12-$month payment plan. In order to have a perfect security interest in the television set, Big Al:

a$.$ should not do anything as it is already perfected.

b$.$ must file a financing statement with the appropriate public office.

c$.$ should have Edith sign another contract recognizing Big Al$$s security interest.

d$.$ must create a field warehousing arrangement.