Describe in words the surface whose equation is given

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Describe in words the surface whose equation is given. φ = π/4 (select the correct answer)

1)the top half of the right circular cone with vertex at the origin and axis the positive z-axis

2)the plane perpendicular to the xz-plane passing through z = x, where x ≥ 0

3)the plane perpendicular to the xy-plane passing through y = x, where x ≥ 0

4)the base of the right circular cone with vertex at the origin and axis the positive z-axis

5)the plane perpendicular to the yz-plane passing through z = y, where y ≥ 0