Give a geometric description of the set of points whose coordinates satisfy the given conditions.x2 + y2 + z2 = 81, z = -2
A. All points within the sphere x2 + y2 + z2 = 81 and above the plane z = -2
B. All points on the sphere x2 + y2 + z2 = 81 and above the plane z = -2
C. The sphere x2 + y2 + z2 = 4
D. The circle x2 + y2 = 77 in the plane z = -2
Answer: D
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