An orifice having a diameter of 1 m is installed in a 2.5 m pipe through which water having a density of 1000 kg/m³ and a viscosity of 1 cp is flowing. The measured pressure difference across the orifice is 98 kN/m². Calculate the volumetric flow rate in m³/s. Assume that C₁ =0.61 and g=9.8 m/s². a) 6.8 m³/s b) 7.5 m³/s c) 8.5 m³/s d) 10.8 m³/s