A nurse is teaching a client with rheumatoid arthritis about the use of methotrexate. Which statement by the client indicates a correct understanding of the safety precautions associated with methotrexate therapy?

I will return to the clinic once a year to have my blood drawn.

I should stop taking oral contraceptives while on methotrexate.

I'll let the doctor know if I develop sores in my mouth.

I can receive MMR, varicella vaccines while on methotrexate.