set -euo pipefail combines three shell-option changes in one statement:
-e (or errexit) makes the shell terminate when a simple command or list returns a non-zero status.
-o pipefail alters pipeline semantics so the pipeline's status is the first non-zero exit status in the chain-allowing -e to detect failures that are not in the right-most command.
-u (or nounset) treats any attempt to expand an unset parameter as an error, causing an immediate exit in non-interactive shells.
Because the options are specified in a single set invocation, the line fulfils the prompt's constraints. The other choices each omit at least one required behavior or do something unrelated (such as command tracing).
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