Satisfactory hydrodynamic film in a journal bearing is formed men
(a) Journal speed is low, unit pressure on the bearing is high and viscosity of lubricant used is low
(b) Journal speed is low, unit pressure on the bearing is low and viscosity of lubricant used is low
(c) Journal speed is high, unit pressure on the bearing is low and viscosity of lubricant used is high
(d) Appropriate combination of journal speed, unit pressure on bearing and lubricant viscosity exists resulting in low coefficient of friction.