Statement I : If dot product and cross product of $\overrightarrow{\mathrm{A}}\text{\hspace{0.17em} and }\overrightarrow{\mathrm{B}}\text{ are zero, it implies that one of the vector }\overrightarrow{\mathrm{A}}\mathrm{and}\overrightarrow{\mathrm{B}}\text{ must be a null vector.}$

Statement II : Null vector is a vector with zero magnitude.

If both statement I and statement II are true and statement II is the correct explanation of statement I.
 

If both statement I and statement II are true but statement II is not the correct explanation of statement I.
 

If statement I is true but statement II is false.
 

If both statement I and statement II are false.