AD Sync Settings - Question about OU's

AD Sync Settings - Question about OU's

I believe I know the answer to this question, but I wanted to verify and I couldn't find it anywhere in official documentation or through questions on this forum.

When adding OU's to the AD sync settings in Desktop Central, does it automatically include any "child" OU's listing under the parent or do they each need to be checked individually?

Here is an example:

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