Is confluent Kafka 6.2.0 is free to use for enterprise level

Hi,

I am working in a small-scale organization, We are planning to do POC using confluent 6.2.0 Kafka . I need clarification on the below points

1> Is Confluent Kafka 6.2.0 is free to use for commercial purposes?
2> Before actual use can we do POC or we need to buy a license ?
3> For small-scale commercial reasons. Can we use Confluent Kafka 6.2.0 without buying any paid support