Which of the following WAN technology types does not use an Ethernet cable as a medium for communication and is used for long distances?

Discuss why you would want to validate a conceptual data model and describe two approaches to validating a conceptual model.

What will be an ideal response?

The following statements are true about a data source except

a. a data source is usually a database. b. a data source can be a text file. c. Data sets contain data retrieved from a data source. d. Data can be retrieved from but not written back to a data source.