AWS Quantum Ledger Database (QLDB) - serverless

A financial services company is looking to implement a ledger database for maintaining immutable and cryptographically verifiable transaction records. They are considering using AWS Quantum Ledger Database (QLDB). What should the Solutions Architect recommend to ensure AWS QLDB is optimized for high performance in handling their transactional workload? —> Answer to this is wrongly mentioned in the quiz. AWS QLDB is serverless but answer is in the quiz is provisioned read and write capacity

Is this for a lab? If so, please supply a link to it so we have some context in answering this. Thanks!

Note that QLDB is now deprecated. This means it is very unlikely to feature in AWS exams