The default scheduling property of MySQL is implemented by how many of these?

MyISAM, MERGE, MEMORY

This question is about how MySQL handles scheduling tasks, like when to run certain queries.

The question asks: How many of these storage engines use the default scheduling property?

Let's look at each option:
* MyISAM is a storage engine, but it doesn't handle scheduling tasks.
* MERGE is a storage engine, but it doesn't handle scheduling tasks.
* MEMORY is a storage engine, but it doesn't handle scheduling tasks.

Since none of the options are involved in scheduling, the answer is Option A: 0.