Which of the following commands is used to display user resource limits?

The `uname` command displays system information like the kernel name, hostname, and operating system, not user resource limits.

`limit -a` is not a standard command in POSIX-compliant shells like Bash for displaying resource limits; `limit` without `-a` exists in some shells like Csh but `ulimit` is the universal command.

`usrlmt` is not a standard command-line utility for managing or displaying user resource limits in Linux.

The `ulimit` command, a shell built-in, provides control over the resources available to processes started by the current shell. Using `ulimit -a` displays all current soft and hard limits for the user, such as open files, CPU time, and memory.