Final answer:
A control biological indicator must be incubated with every biological test to ensure the reliability and accuracy of the sterilization process.
Therefore, option D is correct.
Step-by-step explanation:
The question posed relates to the frequency at which a control biological indicator should be incubated if a biological test is performed daily. The correct answer is d) With every biological test. A control biological indicator is necessary to validate that the sterilization process is working properly and that the test conditions are effective for each cycle. By using a control with every test, one can ensure the reliability and accuracy of the biological test results for each individual procedure.