To start a database transaction in the database, the correct option is D) By setting the autoCommit property of the Connection to false, and execute a statement.
Explanation for each option:
Option A) By asking a Transaction object to your Connection, and calling the method begin() on it - This option is incorrect. While it is possible to start a transaction using a Transaction object, typically, the transaction is managed directly through the Connection object.
Option B) By asking a Transaction object to your Connection, and setting the autoCommit property - This option is incorrect. The autoCommit property determines whether each SQL statement is automatically committed or not. It does not directly start a transaction.
Option C) By calling the method beginTransaction() on the Connection object - This option is incorrect. While some databases provide a method called beginTransaction() to start a transaction, it is not a standard method in the JDBC API.
Option D) By setting the autoCommit property of the Connection to false, and execute a statement - This option is correct. To start a transaction, you can set the autoCommit property of the Connection to false. This means that each SQL statement will not be automatically committed, allowing you to group multiple statements into a single transaction. You can then execute the desired statements to perform your transaction.