Research Questions Deployments Update and Rollback (Add-on)

Refer to the below specification and answer the following questions:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-application
  labels:
    app: web
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.14.2
        ports:
        - containerPort: 80
      - name: logger
        image: log-agent:1.2
      - name: monitor
        image: monitor-agent:1.0