Final answer:
Temporary cards used by agents/brokers in binding risks are commonly valid for 30 days, providing a period of coverage until the official insurance policy is issued.
Step-by-step explanation:
The student has asked a question related to insurance practices, specifically about the validity period of temporary cards used by agents/brokers in binding risks. These cards often serve as proof of insurance until the actual policy is issued. It is critical for agents, brokers, and policyholders to understand the duration of coverage provided by such temporary cards. While the exact time can vary based on jurisdiction and the insurer's policies, a commonly accepted duration for how long temporary cards are valid is 30 days (D). This allows sufficient time for the formal documentation to be processed and for the policyholder to receive their official insurance policy.