An instructor is preparing to teach in a virtual classroom with twenty-five learners. Ten of the learners, all from the same location, report that they cannot login to the virtual classroom. Which of the following is the MOST likely cause? 

Answer options:

A. Anti-virus software is blocking the virtual classroom connection.
B. The learner’s computers cannot handle the virtual classroom.
C. Firewall issues at the instructor`s location.
D. Firewall issues at the learners` location.

D