Each day ted's smartphone receives a training video about another aspect of his job. ted can access these at his leisure and is required to take a quiz to confirm he has watched them. this system of delivering training content is called
a. experiential exercises
b. videoconferencing
c. e-learning
d. mobile learning

D. mobile learning

Explanation:

Mobile learning is a form of distance education and people use mobile device educational technology at their time convenience.

Mobile learning is any type of content that is developed or consumed on mobile devices, such as smartphones and tablets, and including anything from podcasts to full e-Learning courses.

Similarly, the system of delivering training content mentioned in the question is called mobile learning.