Step 1: Understanding the Concept:
On the internet a message is not sent as one block. It is broken into small packets, sent across the network, put back together, and then shown to the user. We arrange the four steps in this natural order.
Step 2: Check option 1.
Option 1 starts with (A), displaying the message. A message cannot be displayed before it is even broken into packets and sent. So option 1 is wrong.
Step 3: Check option 2.
Option 2 also starts with (A) and reassembles packets before transmitting them. Both are out of order. So option 2 is wrong.
Step 4: Check option 3.
Option 3 starts with (B), reassembly, before the packets exist. So option 3 is wrong.
Step 5: Check option 4.
Option 4 is (C) the message is broken into packets, (D) the packets are sent over the network, (B) the packets are put back together at the destination, and (A) the message is displayed on a web page. This is the right order, so option 4 is correct.
Step 6: Final Answer:
The correct order is C, D, B, A, which is option 4.
\[ \boxed{(C),(D),(B),(A)} \]