Consider the following expression

• A. x1 = a - b y1 = p * c x2 = u * v y2 = p + q
• B. x 1 = a - b y1 = x2 * c x3 = u * v y2 = x4 + y3
• C. x1 = a - b y2 = x1 * c x2 = u * v y3 = x2 + y2
• D. p = a - b q = p * c p = u * v q = p + q