Why soft iron is used for electromagnets (high permeability, low retentivity)

1. A.
   low coercivity and high retentivity
2. B.
   low coercivity and low permeability
3. C.
   high permeability and low retentivity
4. D.
   high permeability and high retentivity

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1. A.
   A is not correct but R is correct
2. B.
   Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
3. C.
   Both A and R are correct but R is NOT the correct explanation of $A$
4. D.
   A is correct but R is not correct

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