In the condition of constant flow in the system of tubes:
a. The lateral inside pressure decreases if the diameter of the tube is reduced
b. The lateral inside pressure decreases if the diameter of the tubs enlarges
c. Reduction of the diameter of the tubs results in decrease of the rate of flow
d. Increase of the diameter of the tube increases the rate of flow
e. The flow of liquid is independent on the diameter of the tube
a