Point (c,d) is on the circle represented by x^2+y^2=10, and c, d are integers. How many such points are possible?  Choose the correct choice from the following options
A) 0	B) 2	C) 4	D) 6	E) 8
c^2+d^2=10 and c, d are integers means that 10 is the sum of two perfect squares.   10 is the sum of only one pair of perfect squares 1 and 9.   So, there can be 8 such points, 4 in each quadrant:   (1, 3);   (1, -3);   (-1, 3);   (-1, -3);   (3, 1);   (3, -1);   (-3, 1);   (-3, -1).   Answer: 8.
<result>E</result>
Point (c,d) is on the circle represented by x^2+y^2=10, and c, d are integers. How many such points are possible?