How many observations are in data set WORK.ALL after submitting the program?

Given the SAS data set WORK.EMP_NAME:

Given the SAS data set WORK.EMP_DEPT:

The following program is submitted:

How many observations are in data set WORK.ALL after submitting the program?
A . 1
B. 2
C. 3
D. 5

Answer: B

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