The point P has Cartesian coordinates (2, 1, 1). Find (a) the cylindrical coordinates of P, and (b) the spherical coordinates of P.

a) ( ( √5, arctan(1/2), 1 ) )
b) ( ( √6, arctan(1/2), arccos(1/√6) ) )
c) ( ( √5, arctan(1/2), arccos(1/√5) ) )
d) ( ( √6, arctan(1/2), 1 ) )