A customer recently completed a cloud migration. The cloud and its offline IDC are connected using dual dedicated lines in a primary-backup mode, each with 2GB of bandwidth. Data synchronization…

A customer recently completed a cloud migration. The cloud and its offline IDC are connected using dual dedicated lines in a primary-backup mode, each with 2GB of bandwidth. Data synchronization occurs daily at 2:00 AM. Since the migration, the customer has been running stably for over a year. In recent months, as the customer's business volume has gradually increased, several incidents of increased latency and slow response have occurred, impacting business operations to a certain extent. An outage at the beginning of last month resulted in the loss of some business data, which had a significant impact. Analysis of historical issues revealed that an ECS instance required manual intervention to restart after each failure, and monitoring observed that the dedicated line traffic was saturated for two consecutive weeks. To improve overall business stability, which of the following dimensions can provide availability recommendations? (Multiple choice)