What are the two formats of distance learning that emerged with the advent of digital communication technologies? I - Teleconference and videoconf...

What are the two formats of distance learning that emerged with the advent of digital communication technologies?

I - Teleconference and videoconference are two new formats for distance learning.
II - In teleconferencing, the television signal is generated and transmitted via satellite to the points where the students are located.
III - In videoconferencing, the teacher is seen and heard by his students and can also see and hear them when there is similar equipment in the reception rooms.
IV - Teleconferencing and videoconferencing are similar to traditional television, except for the language used.
V - Videoconferencing allows for interactivity between students and teachers, as if they were in a classroom.
a) I, II, III and IV are correct.
b) I, II, IV and V are correct.
c) II, III, IV and V are correct.
d) I, III, IV and V are correct.
e) All statements are correct.