If a parallelogram is formed with two sides represented by vectors $\overrightarrow{\mathrm{a}}\text{ and }\overrightarrow{\mathrm{b}}$ then $\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}}$ represents the 

None of the above 

Minor diagonal when the angle between vectors is obtuse 

Both of the above 

Major diagonal when the angle between vectors is acute