Which of the task we are performing using following: inside a loop $($which runs for $i=0$ to count of lines$)$ when the loop variable $i\%2$ returns $0,$ print the contents returned by fl$.$readline $()?$

$($A$)$Starting from first line, we keep on printing the alternate lines of the file object $fl.$

$($B$)$Print the contents of the first line of the file object fl$.$

$($C$)$Print the contents of the second line of the file object fl$.$

$($D$)$Print the contents of all lines of the file object fl$.$