A 35yrs lady presents with polyarthritis with elevated RA factor and A.N.A. levels, Which of the following will help to differentiate rheumatoid arthritis from SLE ?

• A. Juxta Articular osteoporosis on X-ray
• B. Soft tissue swelling at the proximal inter phalangial joint
• C. Elevated ESR
• D. Articular erosions on X-ray