Final answer:
The minimum age for a cat to have all of its permanent teeth is 12 months.
Step-by-step explanation:
The minimum age for a cat to have all of its permanent teeth is Option 4: d) 12 months.
According to the provided information, the deciduous teeth, or baby teeth, of humans first begin to appear at about 6 months of age. These baby teeth are then replaced by permanent teeth between the ages of approximately 6 and 12. Therefore, it can be inferred that the same general timeline applies to cats.