If delete record in MA, what happens to it in CRM?

If delete record in MA, what happens to it in CRM?

If I delete a lead in Marketing Automation is it also deleted in CRM? I have done a couple of tests and it is NOT deleted in CRM, but I have found that things behave differently sometimes depending on how the lead as added to CRM or Marketing Automation.

So if I delete a lead in Marketing Automation is it always true that it will NOT be deleted in CRM?