Which of the following types of checks is preprinted and might be used by a physician to pay for out-of-town conference expenses? 

A. Counter
B. Certified
C. Voucher
D. Traveler's
E. Limited

D. Traveler's
Traveler's checks are preprinted in denominations of $10, $20, $50, and $100; they must be signed at the location where they are purchased, then signed again in the presence of the payee. The signatures must match for the traveler's checks to be valid.