The following code block implements the following equation.

Please fill in the blank.

N$=$input$(\text{'}$Please enter N: $\text{'})$;

item$=1$:N;

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

fprintf$(\text{'}\%$f

$\text{'},$ Output$)$;

Question $18$ options:

A$)$

Output $=$ sum$($item$).*$sum$($item$+1)$;

B$)$

Output $=$ sum$($item$.*($item$+1))$;

C$)$

Output $=$sum$($item$)*$sum$($item$+1)$;

D$)$

Output $=$ item.$*($item$+1)$;