The arithametical check for rise and fall method are . . . . . . . .

A. $$\sum {BS} - \sum {FS} = {\text{Last}}\,{\text{RL}} - {\text{First}}\,{\text{RL}} = \sum {{\text{Rise}}} - \sum {{\text{Fall}}} $$

B. $${\text{First RL + Last RL = }}\sum {FS} + \sum {BS} = \sum {{\text{Fall}}} + \sum {{\text{Rise}}} $$

C. $$\sum {IS} + \sum {FS} - {\text{Last}}\,{\text{RL}} - {\text{First}}\,{\text{RL}} = \sum {{\text{Fall}}} + \sum {{\text{Rise}}} $$

D. All

Answer: Option A