Cancellation, per Virginia Code 38.2-3106 (life) and 38.2-3508 (health), is the voluntary termination of a policy by the insured or insurer. Options A, B, and C aren't standard terms for this action in Virginia insurance law. The study guide defines cancellation as a deliberate act, distinct from lapse (nonpayment) or nonrenewal, making D the correct term.