Quiz: reliable scripts

Read the output

What will this script, u.sh, print?

#!/bin/bash
set -u
URL=http://127.0.0.1:8080/health
echo "checking $URl"

• A checking and a blank after it.
• B u.sh: line 4: URl: unbound variable — and the script stops.
• C checking http://127.0.0.1:8080/health