Identify the following surfaces as an elliptical paraboloid, hyperbolic paraboloid, a hyperboloid of one sheet, a hyperboloid of two sheets, a cone, a circular cylinder, an elliptical cylinder, or a parabolic cylinder, and identify the axis of symmetry as the x-axis, the y-axis, or the z-axis. a. −2x2+6y2−z2=0−2x2+6y2−z2=0b. −9x2−9y2+z2=1−9x2−9y2+z2=1c. 3x2+9y2−z=03x2+9y2−z=0d. 6y2−3x2−9z2+1=06y2−3x2−9z2+1=0e. 4y2+4z2=14y2+4z2=1