An online conference room reservation system lets a user reserve rooms. the user is required to enter contact information and reservation detail before saving the room reservation. which of the following identifies the use cases?

a)
reserve room.

b)
reserve room, enter contact information, enter reservation detail.

c)
reserve room, enter contact information and reservation detail.

d)
reserve room, save reservation.

b)Reserve Room, Enter Contact Information, Enter Reservation Detail

Explanation: The use case is described as actors , actors goal, usage of use cases, units of scope and initial point and terminating point of use cases .

The situation mentioned in the question will take place for the reservation of the room through the instances in the form like filling the contact details for the identification , filling out reservation information as well for getting the knowledge about the room requirement by the person.

These details help in reaching out the particular person if required, number of days he wants to book the room,any extra facility he would like to have etc. After these detail filling activity the room can be reserved successfully.Thus , the most appropriate option is option (b).

Other options are incorrect because room reservation cannot be done without any formality as mentioned in the question and entering contact detail and reservation detail one by one.