Which of the following expressions is correct?

If the syntax for the head function is head(set_exp[,index_exp]),then which of the following expressions is correct?
A. head(members([sales_and_marketing].[Products].[Products].[Product line]),2)
B. head(([sales_and_marketing].[Products].[Products].[Product line])[,2])
C. head(order([sales_and_marketing].[Products].[Products].[Product line])2)
D. head(members([sales_and_marketing].[Products].[Products].[Product line],2))

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