Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?

A. 50 : 20 : 20 : 10

B. 40 : 30 : 20 : 10

C. 30 : 20 : 30 : 20

D. 50 : 20 : 10 : 20

E. 50 : 10 : 20 : 20

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