You build a new operational analytics solution in Azure using PostgreSQL as a relational database. The estimated monthly growth of your database is $20$ Gb$.$You need to ensure that your database can scale horizontally and support query parallelization for faster responses on a large dataset, without your team's involvement in database or operating system management,Which deployment option of PostgreSQL in Azure should you use?A$.$ Azure database for PostgreSQL Single ServerB. PostgreSQL on Azure VMsC$.$ Azure database for PostgreSQL Hyperscale $($Citus$)$D$.$ Azure database for PostgreSQL Flexible Server