They help ensure security features are implemented comprehensively is the correct answer.

Companywide secure coding guidelines set consistent expectations for developers and ensure that security features are implemented in a repeatable and auditable way. They document required controls and secure patterns and they drive consistent testing and review practices across teams.

When guidelines are part of the development lifecycle they help ensure that design level security decisions and coding level protections are applied uniformly. This reduces implementation gaps and makes it easier to enforce secure defaults and to integrate automated checks into CI pipelines.

Cloud Security Command Center is incorrect because it is a Google Cloud product for asset discovery and security monitoring and not a set of developer coding guidelines. It is an operational tool rather than a companywide policy for how developers write code.

They reduce some categories of common vulnerabilities is incorrect because it understates the purpose. Secure coding guidelines aim for comprehensive implementation of security controls and secure patterns across the codebase rather than only addressing some vulnerability categories.

They guarantee error free software is incorrect because no guideline can guarantee error free software. Guidelines reduce risk and lower the incidence of vulnerabilities but they cannot eliminate all bugs or design flaws.

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