Final answer:
An insurance company fixed account is often available as a subaccount in a variable product, such as a variable annuity or variable life insurance policy.
Step-by-step explanation:
The statement that is true of an insurance company fixed account but not true of a separate account is that it is often available as a subaccount in a variable product.
An insurance company fixed account is typically offered as an investment option within a variable annuity or variable life insurance policy. It offers a guaranteed rate of return set by the insurance company, which provides stability and security to the investors. On the other hand, a separate account does not have this specific feature.