When evаluаting а patient in Rheumatоlоgy clinic whо presents with complaints of persistently dry eyes and mouth, initial laboratory studies are obtained after the history and physical examination are completed. The results are as follows: (+) Rheumatoid factor (RF), (+) antinuclear antibodies, (+) anticytoplasmic antigen antibodies SS-A and SS-B (also called Ro and La, respectively), and (+) Schirmer test. CBC reveals mild anemia. Based on this information, which of the following conditions is the most likely diagnosis for this patient?