Final Answer:
The command that returns detailed OS information, including the kernel being used and system hostname, is a. SysInfo.
Step-by-step explanation:
The "SysInfo" command is commonly used to retrieve comprehensive system information, including details about the operating system, kernel version, and system hostname. When executed, SysInfo provides a detailed report that encompasses various aspects of the operating environment, aiding in system administration and troubleshooting.
Options b, c, and d are not standard commands for retrieving detailed OS information. "KernelCheck" (Option b) is not a recognized command, "Hostname" (Option c) primarily returns the system hostname, and "InfoAll" (Option d) is not a standard command for obtaining detailed OS information. Therefore, SysInfo is the appropriate choice for a comprehensive overview of the operating system.
Option A is the answer.