Under ASMM (Concrete), when measuring insitu-concrete for stairs, which of the following is true?

	A.	The strings, landings and steps are measured separately.
	B.	The unit of measurement is square metres, with the depth of string mentioned in the item description.
	C.	All concrete in stairs (including strings, landings, steps and the like) are measured together in the item of stairs.
	D.	None of above.