Final answer:
In-transit cash or property insurance or an armored car service policy is the type of insurance that covers robbery of a custodian while performing duties away from the premises.
Step-by-step explanation:
The type of insurance that covers the actual or attempted robbery of a custodian away from the premises while engaged in his/her duties is known as in-transit cash or property insurance or an armored car service policy. This type of coverage is specifically designed to protect businesses against loss of money, securities, or other property that is being transported by a person or service entrusted with it. Insurance policies such as these are essential for businesses that deal with cash transportation or valuable items, ensuring that in the event of a robbery, the business can recover the lost assets.