Match List 1 with List II

List 1 (Data Transmission modes in computer network)		List II (Description)
A	Simplex	I	Data can be sent and received at the same time.
B	Duplex	II	Data can only be sent or received.
C	Half-Duplex	III	Data can be sent and received but not at the same time.

In the light of the above statements, choose the correct answer from the options given below

The correct answer is А-II, В-I, C-III.

Let us carefully analyze each data transmission mode from List I and match it to the most accurate description in List II, step by step.

Step 1: Understand A — Simplex
In Simplex mode, communication is strictly one-directional. Data can either be sent or received, but never both. The sender can only send, and the receiver can only receive — there is no possibility of reversing the roles.
This perfectly matches Description II: "Data can only be sent or received."
So, A → II

Step 2: Understand B — Duplex (Full-Duplex)
In Full-Duplex mode (simply called "Duplex" here), communication is bidirectional and simultaneous. Both parties can send and receive data at the same time, just like a telephone call where both people can speak and listen simultaneously.
This perfectly matches Description I: "Data can be sent and received at the same time."
So, B → I

Step 3: Understand C — Half-Duplex
In Half-Duplex mode, communication is bidirectional but not simultaneous. Data can be sent and received, but only in one direction at a time — the sender must stop transmitting before the receiver can send back. A walkie-talkie is a classic real-world example.
This perfectly matches Description III: "Data can be sent and received but not at the same time."
So, C → III

Step 4: Compile the Final Matching

The correct matching is A-II, B-I, C-III, which confirms the provided correct answer.