Select the correct statement regarding code sets and identifiers.

The social security number has been selected as the National Health Identifier for individuals.

The COT code set is maintained by the American Medical Association.

Preferred Provider Organizations (PPO) are not covered by the definition of "health plan" for purposes of the National Health Plan Identifier

HIPAA requires health plans to accept every valid code contained in the approved code sets

An important objective of the Transaction Rule is to reduce the risk of security breaches through identifiers.