Let A be the set of comfortable houses given asA = {x1/0.8, x2/0.9, x3/0.1, x4/0.7} and B be the set of affordable houses B = {x1/0.9, x2/0.8, x3/0.6, x4/0.2}Then the set of comfortable and affordable houses is

• A. {x1/0.8, x2/0.8, x3/0.1, x4/0.2}
• B. {x1/0.9, x2/0.9, x3/0.6, x4/0.7}
• C. {x1/0.8, x2/0.8, x3/0.6, x4/0.7}
• D. {x1/0.7, x2/0.7, x3/0.7, x4/0.9}