Which of the mentioned below is the formula for calculating side thrust considering stroke length?

Side thrust= (( frac{ pi D^2}{4}) )Pmax

Side thrust= (( frac{ pi D^2}{4}) )

Which of the mentioned below is the formula for calculating side thrus

1.	Which of the mentioned below is the formula for calculating side thrust considering stroke length?
A.	Side thrust=P<sub>b</sub>DL<sub>s</sub>
B.	Side thrust=P<sub>b</sub>D
C.	Side thrust= (( frac{ pi D^2}{4}) )P<sub>max</sub>
D.	Side thrust= (( frac{ pi D^2}{4}) )
Answer» B. Side thrust=P<sub>b</sub>D