What is the central idea in this passage? O Invisible ink was a good choice when writing in code Giving up information could be a disaster for either side. O George Washington could have done a better job managing his spies. * The British used horseback riders to deliver messages

Giving up information could be a disaster for either side.

Explanation:

The central idea in a story or passage is the main point of the passage or story that the author wants to communicate. The central idea is referred to as what the passge is about.

In this case, the central idea of the passage is that "Giving up information could be a disaster for either side".

the answer would be, she updates her online profiles regularly and participates in work-related online discussions.