Covers a wide variety of applications such as web and computer-based training (CBT), and social networks. a. E-learning b. Modeling c. Videodisc instruction d. Vestibule instruction

Option (a) is the correct answer of this question.

Explanation:

E-Learning means that Electronic Learning. It covers a broad spectrum of applications, including online and computer-based training (CBT) and public networks.E-Learning is learning to use new technology to navigate curricula beyond a conventional classroom is known as Electronic learning.

There are two types of E-learning are known as:-

answer; i believe the correct answer is (a) all trenches must have access/egress;