Find the error(s) in this `docker-compose.yml` file extract.

Question

What is/are the error(s) in this `docker-compose.yml` file extract?
```yaml
version: '3'
services:
  web:
    image: nginx
    ports:
      - "80:80"
  database:
    image: postgres
    volumes:
      - data:/var/lib/postgresql/data
networks:
  default:
    driver: custom-driver
```

Accepted Answer

The `data` volume definition is missing.

Answer

The `web` service cannot use port 80 because it is reserved.

Answer

The `custom-driver` network driver is incorrect for the default network.

Answer

No errors in this file.

Question from the Docker compose test

Find the error(s) in this `docker-compose.yml` file extract.