You need to update a deployment in Deployment Manager without any resource downtime in the deployment. Which command should you use? 

Answer options:

A. gcloud deployment-manager deployments create --config <deployment-config-path>
B. gcloud deployment-manager deployments update --config <deployment-config-path>
C. gcloud deployment-manager resources create --config <deployment-config-path>
D. gcloud deployment-manager resources update --config <deployment-config-path>

B

Reference: https://cloud.google.com/sdk/gcloud/reference/deployment-manager/deployments/update