Final answer:
In the context of Computers and Technology, the statement that proper planning guarantees a successful installation aligns with option C. Confirms. It establishes the significance of planning in the outcome of a support specialist's work.
Step-by-step explanation:
The textbook statement that proper planning by a support specialist guarantees a successful installation suggests that there is a direct positive correlation between careful planning and the outcome of an installation process. Given the multiple-choice options provided, the best match is C. Confirms. This is because to confirm means to establish the truth or correctness of something.
In the context of technology and support, proper planning often involves steps like understanding the system requirements, preparing the environment, backing up data, and having a rollback plan in case of issues. By emphasizing these steps, the textbook acknowledges their importance in achieving a successful installation.