Living organisms require at least 27 elements of which 15 are metals. Among these, those required in major quantities include

(a)

Potassium, Manganese, Molybdenum & Calcium

(b)

Potassium, Molybdenum, Copper & Calcium

(c)

Potassium, Sodium, Magnesium & Calcium

(d)

Sodium, Magnesium, Copper & Manganese