If the $B-H$ curves of two samples of $P$ and $Q$ of iron are as shown below, then which one of the following statements is $CORRECT$?
- ABoth $P$ and $Q$ are suitable for making permanent magnets.
- B$P$ is suitable for making permanent magnets and $Q$ for making electromagnets.
- C$P$ is suitable for making electromagnets and $Q$ is suitable for permanent magnets.
- DBoth $P$ and $Q$ are suitable for making electromagnets.
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