Maintenance testing is performed on an existing operational system that has undergone planned enhancements, corrections, or other modifications. The goal is to ensure that the changes have been implemented correctly and that the system continues to function as intended. This type of testing is not typically used for defect correction during development, user acceptance testing complaints, or the integration of functions in new system development.

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Statement coverage is a white-box testing technique that involves executing all the statements in the code at least once. It is not considered a black-box technique because it requires knowledge of the internal structure of the code being tested. Black-box techniques, such as equivalence partitioning, state transition testing, and boundary value analysis, focus on testing the functionality of the software without considering its internal code structure.
Reference: ISTQB CTFL Syllabus, version 4.0, differentiates between black-box and white-box testing techniques, clearly identifying statement coverage as a white-box technique.

Test implementation and execution involve several major tasks, which include:
i. Developing and prioritizing test cases, creating test data, writing test procedures, and optionally preparing the test harnesses and writing automated test scripts. This is crucial for ensuring that all aspects of the software are thoroughly tested and that the tests are prepared systematically.
ii. Creating the test suite from the test cases for efficient test execution. This helps organize the test cases in a way that optimizes the testing process and ensures coverage.
iii. Verifying that the test environment has been set up correctly. Ensuring that the test environment is correctly configured is critical for valid test results.
iv. Determining the exit criteria is part of the test planning phase, not the implementation and execution phase.
According to the ISTQB CTFL Syllabus, version 4.0, these activities are critical for the successful implementation and execution of tests. Therefore, the statement "i, ii, iii are true and iv is false" accurately reflects the tasks involved in this phase.