Study the components given in the box be...

Study the components given in the box below :
`Na^+, K^+, H_2O, CaCO_3, PO_4^(3-), SO_4^(2-)`
How many of the above given components represent inorganic constituents of living tissues?
(a) 5
(b) 6
(c) 4
(d) 3

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