Final answer:
The nurse should report the client's penicillin allergy to the provider before starting cefotetan medication.
Step-by-step explanation:
From the options provided, the nurse should report the client's penicillin allergy to the provider before starting cefotetan medication. Cefotetan is a cephalosporin antibiotic, which belongs to the same class of antibiotics as penicillin. Patients with a known penicillin allergy have a higher risk of cross-reactivity and allergic reactions when taking cephalosporin antibiotics. It is important to inform the provider of this allergy to consider alternative medications and prevent potential adverse reactions.