Which method can be used to produce a timed-release medication?

1. The patient is given the medication in small doses over time, rather than one larger dose.
2. The patient is to take the medication two or three times a day.
3. The medication is provided in special capsules that are subdivided into smaller, pulverized portions of the medicinal compound.
4. The medication compound is produced in very small amounts and each is coated with a material of varying thickness.