Which of the following statements about Data Warehouses are correct?Group of answer choicesData warehouses are suited to answering low-level questions, such as "what is customer X's phone number?"A data warehouse star schema is in third normal formData is transferred from the operational database(s) to the data warehouse via recovery systemsData warehouses are subject-oriented, integrated, time-variant and non-volatile

The correct statements about Data Warehouses are:

1. Data is transferred from the operational database(s) to the data warehouse via recovery systems: This statement is incorrect. Data is typically transferred from operational databases to a data warehouse through ETL (Extract, Transform, Load) processes, not recovery systems.

2. A data warehouse star schema is in third normal form: This statement is incorrect. A star schema is a type of database schema that is optimized for data warehouse and OLAP (Online Analytical Processing) systems. It is not in third normal form, which is a type of database normalization designed to reduce redundancy in relational databases.

3. Data warehouses are suited to answering low-level questions, such as "what is customer X's phone number?": This statement is incorrect. Data warehouses are designed for complex queries and data analysis rather than simple, low-level queries. Operational databases are more suited to answering these types of questions.

4. Data warehouses are subject-oriented, integrated, time-variant and non-volatile: This statement is correct. These are the four main characteristics of a data warehouse according to Bill Inmon, who is considered the father of data warehousing.

So, the only correct statement about Data Warehouses from the given options is "Data warehouses are subject-oriented, integrated, time-variant and non-volatile".