Import Mode for Termination

B.

The correct import mode that will terminate the configuration import process if the imported configuration is incompatible with the existing system is "atomic".

Here's a detailed explanation of each import mode and their characteristics:

1. Merge: This import mode combines the imported configuration with the existing configuration. If there are any conflicts between the two configurations, the imported configuration takes precedence. This mode will not terminate the import process if there are any incompatibilities.

2. Atomic: This import mode verifies the compatibility of the imported configuration with the existing system before the import process begins. If the imported configuration is found to be incompatible with the existing system, the import process is terminated. This mode ensures that the imported configuration will not cause any issues in the existing system.

3. Best effort: This import mode attempts to import as much of the configuration as possible, even if it is not fully compatible with the existing system. This mode is useful when it is not critical to ensure that the imported configuration is completely compatible.

4. Replace: This import mode completely replaces the existing configuration with the imported configuration. If the imported configuration is incompatible with the existing system, it can cause serious issues. This mode should be used with caution.

In summary, the "atomic" import mode is the best choice when it is important to ensure that the imported configuration is fully compatible with the existing system. It will terminate the import process if any incompatibilities are found, preventing any potential issues in the existing system.