Which practice enables recovery of accidental deletions in data records? Maintaining a ___ of all data allows tracking changes in data. This practice is useful in case there are accidental deletions in data records.

Nextdoor is an instant messaging application for smartphones. new smartphone users find it easier to connect with friends and relatives through this mobile app when compared to other similar instant messaging applications. hence, it has the largest user base in the industry. thus, nextdoor app's value has increased primarily due to itsa. learning curve effects. b. economies of scale. c. economies of scope. d. network effects.