In this question, we are given the sales figures for three different types of network servers over three months. We need to determine which server had its unit price changed in March.

To find the answer, we should examine the sales figures for each server. If the unit price of a server changed, we would expect to see a significant change in the sales figures for that server in March compared to the previous months.

Looking at the data, we observe that the sales figures for option 3, ZXC63, had a substantial increase in March compared to the previous months. This suggests that the unit price of ZXC63 was changed in March to drive higher sales.

The other options, ZXC43 and ZXC53, do not show a significant change in sales figures in March, indicating that their unit prices remained unchanged. Therefore, option 3, ZXC63, is the correct answer.

Alert - correct answer should be "None of them". There is no significant change in sales figures for any of the servers in March, indicating that none of their unit prices were changed.