Computer Science for IGCSE & O level - Data Transmission (Section 2 - No. 3)

In the context of data transmission, which of the following is a characteristic of the 'Simplex' mode?

Data can be sent in both directions at the same time.

Data can be sent in both directions but not simultaneously.

Data can only be sent in one direction.

Data is never transmitted.

Simplex mode allows data to be transmitted in only one direction.