Will report if copied $,$ Need perfect Answer and dont give copied answer

Question $1$

Topic civil Engineering

Which one of the following statements is correct to remote sensing$?$

A$.$ The basic property used to identify objects, is called signature.

B$.$ The ratio of the reflected flux to incident flux is called reflectance which varies fron $0$ to $1.$

C$.$ The surface from which emergent radiance is constant in all directions is called Lambertian surface.

D$.$ All of these.