Two pulleys of radii r1 and r2 and at distance x apart are connected by means of a cross belt drive. The length of the belt is

• A. <img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-1.png">
• B. <img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-2.png">
• C. <img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-3.png">
• D. <img src="/_files/images/mechanical-engineering/theory-of-machines/488-200-4.png">