The angle between vectors \[(\overrightarrow{\text{A}}\times \overrightarrow{\text{B}})\] and \[(\overrightarrow{\text{B}}\times \overrightarrow{\text{A}})\] is

• A.                 Zero      
• B.                 p
• C.                 \[\pi /4\]             
• D.                 \[\pi /2\]