Explanation:

Let’s break it down:

- Order 7, Rule 14 – This is about the production of documents relied upon in the plaint, not about service of summons.

- Order 5, Rule 27 – This one is spot on. It specifically deals with how to serve summons to a civil public officer or someone working for the Railways or a local authority. Basically, it explains the special process for people in these positions.

- Order 6, Rule 10 – This is about pleading amendments and not at all about serving public officers.

- Order 10, Rule 8 – Here we're talking about the examination of parties by the court, not service of summons.

So, the right answer is clear:

Option 2: Order 5, Rule 27 is correct.