Final answer:
a. When changes are made to a document, both parties should initial or sign near each change to indicate acknowledgment and agreement to these modifications.
Step-by-step explanation:
a. The correct action to take when changes are made to a document is to have both parties initial or sign near each change. Initialing or signing ensures that both parties acknowledge and agree to the modifications that have been made.
This is a standard practice in contract law and helps prevent disputes about what was agreed upon. It's important to note that only the relevant initials of the parties are necessary, not the full name unless specifically requested.