While preparing to administer a client's morning medications, the nurse notes the client is to receive heparin 5,000 units subcutaneously and has a new order for enoxaparin. What action should the nurse take?

Check the client's activated partial thromboplastin time (aPTT).

Hold both medications and clarify the order with the prescriber.

Administer the injections in separate sites.

Administer the enoxaparin and hold the heparin.