most likely: busy and difficult
This is a personal question, which means that only you can answer it. However, I can give some examples that might help guide your work.
An example of a primary source that you might encounter in your own life is that of a news article. As this article is likely to be written by a reporter witnessing the events, it can be considered a primary source. On the other hand, an example of a secondary source would be a non-fiction book that talks about a historical event. This is because such a book would give a second-hand account of an event based on historical information.
They were too large and expensive - typically a computer would fill a room and would have to have its own power supply.
Christianity? I’m not so sure but I think this is the awnser
They were replaced by a group called the black and tans. Their real name was <span>Royal Irish Constabulary Special Reserve, but that was a commonly used phrase to describe them. They were a unit designed to help the local police force and provide support in fighting the IRA and extremists. </span>
