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NEW QUESTION 49
Encryption is a mechanism for protecting data.
When should encryption be applied to data?
Choose the best answer.

• A. When data is at rest.
• B. When data is at rest or in transit.
• C. When data is in transit.
• D. When data is at rest, unless you are using local storage.

Answer: B

Explanation:
Correct answer B. When data is at rest or in transit.
To provide maximum protection, encrypt data both in transit and at rest.

NEW QUESTION 50
A data analyst has been asked to merge the tables below, first performing an INNER JOIN and then a LEFT JOIN:

Customer Table -
In-store Transactions -

Which of the following describes the number of rows of data that can be expected after performing both joins in the order stated, considering the customer table as the main table?

• A. INNER: 9 rows; LEFT: 15 rows
• B. INNER: 9 rows; LEFT: 6 rows
• C. INNER: 6 rows; LEFT: 9 rows
• D. INNER: 15 rows; LEFT: 9 rows

Answer: D

NEW QUESTION 51
Jhon is working on an ELT process that sources data from six different source systems.
Looking at the source data, he finds that data about the sample people exists in two of six systems.
What does he have to make sure he checks for in his ELT process?
Choose the best answer.

• A. Missing Data.
• B. Invalid Data.
• C. Redundant Data.
• D. Duplicate Data.

Answer: B

Explanation:
Duplicate Data.
While invalid, redundant, or missing data are all valid concerns, data about people exists in two of the six systems. As such, Jhon needs to account for duplicate data issues.

NEW QUESTION 52
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