The correct answer is C (Amazon Neptune) and E (Amazon Redshift). Both Amazon Neptune and Amazon Redshift are fully managed services that provide high availability and durability by default through automatic replication of data across multiple Availability Zones. Amazon Neptune is a graph database service, and Amazon Redshift is a data warehouse service. The other options, A (Amazon ElastiCache), B (Amazon RDS for Oracle), and D (Amazon DocumentDB with MongoDB compatibility), do not provide replication across multiple Availability Zones by default. While they may offer high availability and durability through other mechanisms, such as Multi-AZ deployments or cluster replication, the replication is not provided by default with their cloud-native storage.