Final answer:
The appropriate privacy by design approach to respect the privacy of the user while making the service available is to obtain explicit consent from the user before collecting their geo location.
Step-by-step explanation:
The appropriate privacy by design approach to respect the privacy of the user while making the service available is to obtain explicit consent from the user before collecting their geo location. This ensures that the user is informed and has control over their personal data. Collecting the geo location without consent or sharing it with third parties without consent would violate the user's privacy rights.