Select all statements that correctly describe distributed database management systems $($DDBMSs$)$:

Group of answer choices

When compared to a centralized DBMS$,$ a distributed DBMS usually has higher availability to the database clients

When compared to a centralized DBMS$,$ a distributed DBMS is usually more complex

If two or more database instances maintain the data for a single logical database schema, the underlying database management system is always a DDBMS

When a single database management system runs across multiple processors and disks, it is a DDBMS

If a database instance can be accessed by a database client over a computer network, that instance's underlying database management system is always a DDBMS