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If the permissible crushing stress for the material of a key is double the permissible shear stress, then the sunk key will be equally strong in shearing and crushing if the key is a                            

(a)  Rectangular key with width equal to half the thickness

(b)  Rectangular key with width equal to twice the thickness

(c) Square key

(d) Rectangular key with width equal to one-fourth the thickness

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