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The correct relation between curve lead (CL), switch lead (SL) and lead of cros¬sing (L) is given by__________________?

The correct relation between curve lead (CL), switch lead (SL) and lead of cros¬sing (L) is given by__________________?

A. CL = L – SL
B. L =CL-SL
C. SL = L + CL
D. L = (CL+SL)/2