PCA (Prometheus Certified Associate) sample exam question with answer 185

Question:
What selector will match on time series whose mountpoint label doesn’t start with /run

node_filesystem_avail_bytes{device="/dev/sda2", fstype="vfat", instance="node1", mountpoint="/boot/efi"}
node_filesystem_avail_bytes{device="/dev/sda2", fstype="vfat", instance="node2", mountpoint="/boot/efi"}
node_filesystem_avail_bytes{device="/dev/sda3", fstype="ext4", instance="node1", mountpoint="/"}
node_filesystem_avail_bytes{device="/dev/sda3", fstype="ext4", instance="node2", mountpoint="/"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node1", mountpoint="/run"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node1", mountpoint="/run/lock"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node1", mountpoint="/run/snapd/ns"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node1", mountpoint="/run/user/1000"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node2", mountpoint="/run"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node2", mountpoint="/run/lock"}
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node2", mountpoint="/run/snapd/ns")
node_filesystem_avail_bytes{device="tmpfs", fstype="tmpfs", instance="node2", mountpoint="/run/user/1000"}

1. node_filesystem_avail_bytes{mountpoint!~"/run.*"}
2. node_filesystem_avail_bytes{mountpoint!~"/run.^**"}
3. node_filesystem_avail_bytes{mountpoint!~"/run"}
4. node_filesystem_avail_bytes{mountpoint!="/run.*"}

Answer:
A - is the correct answer