Which of the following statement are incorrect regarding arrangements of battens as per IS 800: 2007?

For a battened compression member:

i) The spacing of battens shall be such that the slenderness ratio of any component should be less than 50.

ii) The thickness of the batten plates shall be less than one of the distance between the rivets.

iii) The effective depth of any batten shall not be less than twice the width of one member.

iv) The effective slenderness ratio of the battened column shall be taken as 1.5 times the actual slenderness ratio.