Identify the surfaces in spherical coordinates.
S1​:rhosinϕ=1,S2​:rhocosϕ=2,S3​:ϕ=6π​
a. S1​ : cylinder, S2​ : horizontal plane, S3​ : cone
b. S1​ : horizontal plane, S2​ : cylinder, S3​ : cone
c. S1​: sphere, S2​: cylinder, S3​ : vertical plane
d. S1​: cone, S2​: sphere, S3​ : vertical plane
e. S1​ : sphere, S2​ : horizontal plane, S3​ : cylinder