Which of the following statements hold good for a multi-collar thrust bearing carrying an axial thrust of \(W\) units?

1). Friction moment is independent of the number of collars 2). The intensity of pressure is affected by the number of collars 3). Co-efficient of friction of the bearing surface is affected by the number of collars

(a) 1 and 2

(b) 1 and 3

(c) 2 and 3

(d) 1,2, and 3.