In the textbook, there are $4$ parts listed that summarize the buyer's duties of performance under a sales contract. Describe these four phases in the order in which they are presented in the text. $($A list without and explanation will receive only partial credit.$)$

$1.$ Buyer's responsibility 

$2.$ Buyer's responsibility 

 

$3.$ Buyer's responsibility 

 

 $4.$ The fourth element is something a buyer may do but does not have to do$.$  Under what circumstances might the buyer exercise this right? $$