Final answer:
Only a permanently installed radio is typically covered under a personal auto policy, while a briefcase, laptop, and portable radio are not.
Step-by-step explanation:
Under a personal auto policy, the type of coverage for personal belongings can vary, but typically, a personal auto insurance policy is designed to cover items that are part of the car. Therefore, the only item from the list that would usually be covered is the permanently installed radio. Personal belongings like a briefcase, laptop, and portable radio are generally not covered under the standard auto policy; they may be covered by other insurance policies like homeowners or renters insurance. It's important to review the specifics of your policy or check with your insurance provider for clarification on coverage limits and exclusions.