Can I apply ED to one school and EA for other schools at the same time?

Or no?

It depends on the college. If the EA school is REA or SCEA then no. Look at each college’s website.

Yes, if the EA is non-restrictive. But if you get an ED acceptance, all other applications must be rescinded or offers must be turned down.

Generally yes except for EA colleges that specify that EA applicants should not apply ED elsewhere. Of course, applying ED means that if you are admitted and the financials work (use the net price calculator before applying), then you are committed to attend. Apply ED only if you would choose that college even if all other colleges gave you a full ride.

Georgetown and BC do not allow you to apply EA at their school and ED somewhere else