Which of these return a result to the client?

This question asks which of the following MySQL components send data back to the user (or client) who requested it.
Let's break down each option:
Option A: Stored functions: Stored functions are like mini-programs stored within the database. They perform a specific task and always return a value. Think of them like a calculator: you give it some numbers and it gives you back the result.
Option B: Stored procedures: Similar to stored functions, they perform a series of actions. But, they can optionally return a value. They are more versatile and can also modify data in the database.
Option C: Triggers: Triggers are automatic actions that happen when something specific occurs in the database (like adding a new row). They don't directly return data to the client, but they can modify data.
Option D: Events: Events are scheduled actions that happen at a specific time or after a specific event. Like triggers, they also don't directly return data to the client. They are often used for automated tasks.
So, the answer is:
A: Stored functions and B: Stored procedures.
They can both send data back to the client who called them.