All the following are Modes of Reservations EXCEPT:a.       Letterb.       CRSc.       Travel Agentd.       E-mail/internet

The question is asking which of the following is NOT a mode of making reservations. The options are:

a. Letter b. CRS c. Travel Agent d. E-mail/internet

To answer this question, we need to understand what each option means:

a. Letter: This refers to the traditional method of sending a written request for reservation through postal mail.

b. CRS: This stands for Central Reservation System. It is a computerized system used by travel agencies and travel websites to automatically obtain and compare information for booking rooms in hotels.

c. Travel Agent: This is a professional who provides travel and tourism related services to the public on behalf of suppliers such as airlines, car rentals, cruise lines, hotels, railways, and package tours.

d. E-mail/internet: This refers to making reservations online either through email or through a website.

From the above explanations, all the options listed are valid modes of making reservations. Therefore, the question seems to have a mistake as all the options given are indeed modes of reservations.