Explanation:

- Option 1: Section 324

- This section pertains to voluntarily causing hurt by dangerous weapons or means.

- Not relevant for administration of unwholesome drug.

- Option 2: Section 328

- Relates to causing harm by means of poison or any noxious thing with intent to cause hurt, or commit an offense.

- Includes acts where harm may not result but intent is present.

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- Option 3: Section 326

- Involves voluntarily causing grievous hurt by dangerous weapons or means.

- Not specifically targeted at administering unwholesome drug unless grievous hurt results.

- Option 4: All of the above

- Incorrect, as not all sections pertain to administration of unwholesome drugs.

Section 328 is the accurate choice here given its specification towards noxious substance administration.