Exam Associate-Cloud-Engineer Topic 4 Question 99 Discussion

Your engineers need to pass database credentials to a Kubernetes Pod. The YAML they're using looks similar to the following:
apiVersion: "extensions/v1beta1"
kind: "Deployment"
metadata:
name: "products-service"
namespace: "default"
labels:
app: "products-service"
spec:
replicas: 3
selector:
matchLabels:
app: "products-service"
template:
metadata:
labels:
app: "products-service"
spec:
containers:
- name: "products"
image: "gcr.io/find-seller-app-dev/products:latest"
env:
- name: "database_user"
value: "admin"
- name: "database_password"
value: "TheB3stP@ssW0rd"
What is Google's recommended best practice for working with sensitive information inside of Kubernetes?