Phát biểu nào sau đây là đúng? A. −−→ A B − −−→ A C = −−→ B C ∀ A , B , C . B. −−→ A B − −−→ A C = −−→ C B ∀ A , B , C .

\(\overrightarrow {{\rm{AB}}} - \overrightarrow {{\rm{AC}}} = \overrightarrow {{\rm{BC}}} \forall {\rm{A}},{\rm{B}},{\rm{C}}.\)

\(\overrightarrow {{\rm{AB}}} - \overrightarrow {{\rm{AC}}} = \overrightarrow {{\rm{CB}}} \forall {\rm{A}},{\rm{B}},{\rm{C}}.\)

\(\overrightarrow {{\rm{AB}}} - \overrightarrow {{\rm{AC}}} = 2\overrightarrow {{\rm{BC}}} \forall {\rm{A}},{\rm{B}},{\rm{C}}.\)

\(\overrightarrow {{\rm{AB}}} - \overrightarrow {{\rm{AC}}} = 2\overrightarrow {{\rm{CB}}} \forall {\rm{A}},{\rm{B}},{\rm{C}}.\)