Comprehensive and Detailed 150 to 250 words of Explanation:

To 41ensure "all-or-nothing" behavior across multiple, distinct DML operations (such as an insert followed by a delete), a developer must manage the transaction boundary manually. In Apex, while a single insert statement is atomic, multiple statements are not automatically linked; if the second statement fails, the first statement's changes would typically remain committed to the database.

The correct implementation is to use Savepoints (Option B). By calling Database.setSavepoint(), the developer marks a specific state of the database. All subsequent DML operations are wrapped in a try-catch block. If an exception occurs during any of the operations, the code enters the catch block, where Database.rollback(sp) is called. This command reverts the database to the exact state it was in when the savepoint was created, effectively undoing any successful DML that occurred before the error.

Option A (SaveResults) allows for partial success, which contradicts the requirement to "prevent all execution." Option C (manual cleanup) is error-prone and cannot reliably revert system-generated fields or complex triggers. Option D (addError) is used in triggers to block a transaction but does not provide the programmatic rollback control needed for general Apex logic involving multiple lists.