The correct service for managing SSL/TLS certificates is AWS Certificate Manager (ACM), which handles the provisioning, management, and deployment of public and private SSL/TLS certificates. AWS Key Management Service (KMS) is focused on creating and controlling keys for encryption, not on SSL/TLS certificates. AWS Secrets Manager is involved with storing, managing, and retrieving database credentials, API keys, and other secrets, and does not directly manage SSL/TLS certificates. AWS Identity Center provides identity services and single sign-on but is not related to SSL/TLS certificate management.