Final answer:
A shard in Kinesis Data Streams can support a maximum of 5 read transactions per second.
Step-by-step explanation:
The Kinesis Get Records operation in Amazon Kinesis Data Streams allows you to retrieve data records from a shard. The number of read transactions per second that a shard can support depends on its provisioned capacity. Each shard is provisioned with a maximum Read Capacity Units (RCU) of 5 transactions per second. It means that a shard can handle up to 5 read transactions per second.