In Vector space, standard basis for a Euclidean space is the set of unit vectors pointing in the direction of the axes of a Cartesian coordinate system. What is the length of Unit basis vector?

In Vector space, the standard basis for a Euclidean space is the set of unit vectors pointing in the direction of the axes of a Cartesian coordinate system. What is the length of the Unit basis vector?

a.1

b.3

c.2

d.0