While at a customers home, a technician has to call a vendor to help fix the problem. Which of the following would be the BEST action for the technician to take?

A.
Ask permission to use the customers telephone and reassure the customer that the telephone call is necessary.

B.
Use the customers telephone to make the call without asking permission and tell the customer that the call is just back to the local office.

C.
Inform the customer that a new service appointment must be set after the technician contacts the vendor.

D.
Explain to the customer that call has to be made to fix the problem and then return to the office to place the call.