Which of the following is not the operating mode of Spark?

Which of the following descriptions about the characteristics of HDFS is wrong?

Huawei Cloud Domain Name Service currently supports multiple domain names to share a digital certificate, but the domain name must be a domain name at the same level, such as: p1 Huaweicloud.com, p2 huaweicloud.com

When using a Huawei Cloud RDS instance, users can configure an appropriate parameter group for the instance according to actual business needs. In which of the following situations, the RDS parameter group cannot be changed? (Multiple choice)

When a user configures an ECS host in a HUAWEI CLOUD VPC subnet and wants hosts in other subnets under the same VPC to use it as a NAT proxy, but finds that this configuration has not successfully met the requirements, which of the following statement is correct?