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Where do the impurity states get formed in an n-type and p-type doped semiconductor?

Where do the impurity states get formed in an n-type and p-type doped semiconductor? Correct Answer Below the bottom of the conduction band and just above the top of the valence band respectively

Impurities are formed just below the bottom of the conduction band and just above the top of the valence band in an n-type and p-type doped semiconductor respectively. Since, there is a close proximity of these impurity states to their respective energy bands, a high probability of excitation of extrinsic carriers to these bands exists. This increases the electrical conductivity of doped semi-conductor.

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