What from the following list of statements about vectors is definitely true? (section 3.3) the magnitude of a vector can be smaller than length of one of its components. magnitude of a vector is positive if it is directed in +x and negative if is is directed in -x direction. magnitude of a vector can be zero if only one of components is zero. if vector a has bigger component along x direction than vector b, it immediately means, the vector a has bigger magnitude than vector b. magnitude of a vector can be zero only if all components of a vector are zero.