Explanation:

Here’s the thing, courts send those letters—letting the accused either show up and defend themselves or just admit guilt and pay a fine by post—in very specific types of cases. Let’s break down the options:

- Option 1: Warrant case

- Nope. Warrant cases are for more serious crimes (punishable by death, life imprisonment, or more than two years in prison). They’re not settled just by sending a fine in the mail.

- Option 2: Bailable

- This is about whether you can get bail easily, not about how you’re summoned or punished. Irrelevant here.

- Option 3: Summary Trials

- Not quite. These are for minor offences and quick proceedings, but what really matters is how charges are summoned, not that fines can be paid by post.

- Option 4: Summons cases

- This is your match. Summons cases deal with less severe offences, and the court can indeed send a letter (i.e., a summons) with the option to admit guilt and pay a fine without coming to court.

In a nutshell:

Option 4: Summons cases is the right answer.