The correct answer is A. Detailed guides for resolving common issues, because effective deployment documentation must support ongoing troubleshooting and support, not just initial installation. Including known issues and resolution steps allows future technicians to resolve problems efficiently and consistently.
According to the Quentin Docter - CompTIA A+ Complete Study Guide, high-quality technical documentation should include error conditions, common failure points, and step-by-step remediation procedures. This information significantly reduces mean time to resolution (MTTR) and improves service quality.
The Travis Everett & Andrew Hutz - All-in-One Exam Guide emphasizes that help desk documentation should evolve over time, incorporating lessons learned from previous incidents. Troubleshooting guides turn deployment documentation into a practical reference rather than a static record.
The Mike Meyers / Mark Soper Lab Manual further clarifies that email logs are informal and unstructured, vendor contact information is supplementary, and end-user manuals are not intended for technical troubleshooting. None of these provide actionable guidance for technicians resolving future issues.
Because the goal is to ensure long-term supportability and effective troubleshooting, the most important inclusion is detailed guides for resolving common issues, making A the correct answer.