Which one of the following symbols would you like to use for the expression 5+6? \[\bigcap{{}}=9,\coprod{{}}=11,\bigcup{{}}=13,\prod{{}}=15\]

• A. \[\bigcap{{}}\]     
• B.   \[\coprod{{}}\]
• C. \[\bigcup{{}}\]   
• D. \[\prod{{}}\]
• E. None of these