Final answer:
When a lease requires notices to be mailed, you need to add extra days to the notice period to account for mail delivery time. The standard practice is to add three days.
Step-by-step explanation:
When a lease requires that all notices must be mailed, you need to add additional days to the notice period to account for the time it takes for the notice to be delivered by mail.
Generally, the standard practice is to add an additional three days to the notice period.
For example, if the notice period without the mailing requirement is 10 days, you would add 3 days to it, making it 13 days in total. This allows for the extra time it takes for the notice to be delivered by mail.
Therefore, the correct answer to your question is 3 days (option b).