The issue of errors and delays due to unplanned manual configuration of target environments points to inconsistent or poorly managed environments. ITIL 4 recommends leveraging Infrastructure as Code (IaC) (Option A) to address this, as IaC automates and standardizes environment provisioning, ensuring consistency and reducing manual errors.

Option A (Leverage Infrastructure as Code):Correct, as IaC (e.g., using tools like Terraform or Ansible) defines environments in code, enabling repeatable, error-free setups and directly addressing the problem of manual configuration errors.

Option B (Use incremental deployments):Incorrect, as incremental deployments focus on releasing smaller changes but do not address the root cause of environment configuration issues.

Option C (Integrate build, test, and deployment activities):Incorrect, as while integration improves pipeline flow, it does not specifically resolve manual configuration errors in target environments.

Option D (Automate the CI/CD pipeline):Incorrect, as automating the pipeline is a broader solution that may include IaC, but it is not specific enough to address the environment configuration issue directly.