Which of the following is true if $|\vec{AB}|=|\vec{CD}|$ and $\vec{AB}\parallel\vec{CD}$ (with same direction)?

• a$\vec{AB}=\vec{CD}$
• b$\vec{AB}=m\vec{CD}$, where $m>1$
• c$\vec{AB}+\vec{DC}>\vec{0}$
• d$\vec{AB}+m\vec{CD}=\vec{0}$, where $m>1$