Which of the following is NOT a type of travel document?

The correct choice is D, which is identified as "Electronic Pass." This option does not represent a standard type of travel document in the same manner as the others listed. An e-ticket is a digital version of a travel ticket, which is commonly used in the industry. A value bearing ticket, typically found in various forms of transportation, represents a ticket that holds a monetary value or can be redeemed for travel. Book tickets, often associated with travel reservations, allow for confirmation of travel across various modes of transportation and can be physical or digital.

In contrast, an electronic pass may refer to a system that grants access to services or facilities, but it does not fit the typical definition of a travel document used for transportation purposes. Travel documents generally serve to confirm a passenger's purchase of transport services, which is primarily what the other options represent.