Final answer:
The correct term for the action of deleting terms or provisions in a signed purchase agreement by lining them out with a pen or covering them with white-out is redaction. Hence, option (1) is correct.
Step-by-step explanation:
The process of deleting or obscuring terms or provisions in a signed purchase agreement by lining them out with a pen or covering them with white-out is referred to as redaction. Redaction involves the removal or masking of specific information from a document, often to protect sensitive or confidential information. In the context of a purchase agreement, redaction may occur when certain terms are no longer applicable or when there is a need to modify the agreement based on negotiations or changes in circumstances.
An amendment is a formal change, cancellation involves terminating the entire agreement, and modification is a more general term referring to changes or alterations, which may or may not involve the termination of the entire agreement.