(a) When the contract for sale is unconditional and the goods involved are in a deliverable state at the time the purchase is made.
(b) When the subject of the contract involves specific goods to which the seller is obligated to do something, such as repair, clean or modify, in order to get them in a deliverable state.
(c) When the contract for sale involves specific, identified goods which must be weighed or measured before being given to the buyer.
(d) When the goods are delivered to the buyer on approval.
(e) When goods purchased by description have not been selected, separated out, or manufactured, at the time the sales contract is entered into.