What Is Meant by Curl $\vec { F }$ Where $\vec { F }$

What is meant by curl $\vec { F }$ where $\vec { F }$ is a vector field? Is curl $\vec { F}$ a vector or a scalar?

A) curl $\vec { F}$ is a scalar which tells you how a vector field is rotating.Its direction gives the axis of rotation; its magnitude gives the strength of rotation about the axis.
B) curl $\vec { F }$ is a vector which tells you how a scalar field is rotating.Its direction gives the axis of rotation; its magnitude gives the strength of rotation about the axis.
C) curl $\vec { F }$ is a vector which tells you how a vector field is rotating.Its direction gives the axis of rotation; its magnitude gives the strength of rotation about the axis.
D) curl $\vec { F}$ is a vector which tells you how a vector field is rotating.Its magnitude gives the axis of rotation; its direction gives the strength of rotation about the axis.
E) curl $\vec { F }$ is a scalar which tells you how a scalar field is rotating.Its magnitude gives the strength of rotation about the axis.