Consider the beam ABCD and the influence line as shown below.

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Consider the beam ABCD and the influence line as shown below. The influence it pertains to

1. reaction at A, R_A
2. shear force at B, V_B
3. shear force on the left of C, V_C^–
4. shear force on the right of C, V_C⁺

Correct Option: B

By muller Breslaw principle.