Which of the following will the split command do on a file when no other options are specified?

It will split a file into new files that are $1$ kilobyte each.

It will split a file into new files that are $1,000$ lines each.

It will split a file into new files that are $1$ megabyte each.

It will split a file into new equally sized files that are $\frac{1}{10}$ th of the original file size.