A 40 yrs old male developed persistant oral ulcers followed by multiple flaccid bullae on trunk and extremities.Direct examination of a skin biopsy immunoflurescence showed intracellular IgG deposits in the epidermis.The most probable diagnosis is:

• A. Bullous Lupus erythematosus
• B. Epidermolysis bullosa acquisita
• C. Pemphigus vulgaris
• D. Bullous Pemphigoid