Implementing multi-factor authentication and encrypting all data at rest and in transit, assuming the PaaS provider handles all other security aspects.

Establishing comprehensive security requirements for the application code, including adherence to secure coding practices, regular vulnerability assessments, and code reviews.

Focusing exclusively on securing the network infrastructure and endpoints that access the PaaS environment, neglecting application-level security.

Depending entirely on the PaaS provider's built-in security features without any additional security measures from your side.