Audio conferencing
A. i, ii, iii and v only
B. i, ii, iii and iv only
C. i, ii, iv and v only
D. All i, ii, iii, iv and v
Answer:D
Audio conferencing
A. i, ii, iii and v only B. i, ii, iii and iv only C. i, ii, iv and v only D. All i, ii, iii, iv and v