Please help me with 2nd sum

2. Consider the circle x² + y² -  8x - 18y + 93 = 0 with cantre 'C' and   are point P( 2, 5 ) outside it. From the point P, a pair
of tangents PQ  and PR are drawn to the circle with S as the midpoint of QR.
The line joining P to C intersects the given circle  at A and B Which of the following hold(s) good?
(A) CP is the arithmetic mean of AP and BP.
(B) PR is the geometric mean of PS and PC.
(C) PS us the harmonic mean of PA and PB.
(D) The angle between the two tangents from P is tan^-1 $\left(\frac{3}{4}\right).$