Which of the following commands creates a function in Bash that outputs the sum of two numbers?
A. function sumitup { echo $(($1 + $2)) ; }
B. command sumitup { echo $(($1 + $2)) ; }
C. function sumitup { echo $1 + $2 ; }
D. method sumitup { echo $1 + $2 ; }
E. command sumitup { echo $1 + $2 ; }
