If L1 and L2 are actual and theoretical lengths of a tongue rail, d is heel divergence and t is thickness of tongue rail at toe, the switch angle is

• A. <img src="/_files/images/civil-engineering/railways/57-17-125-1.png">
• B. <img src="/_files/images/civil-engineering/railways/57-17-125-2.png">
• C. <img src="/_files/images/civil-engineering/railways/57-17-125-3.png">
• D. <img src="/_files/images/civil-engineering/railways/57-17-125-4.png">
• E. <img src="/_files/images/civil-engineering/railways/57-17-125-5.png">