To determine the number of observations and variables in the output dataset, let's go through the given code step by step.
The code snippet data a; initializes a dataset named "a".
The do X=1 to 3; statement starts a loop that iterates from 1 to 3.
Within the loop, the input ID NAME $ AGE; statement reads three variables from the input data: ID (numeric), NAME (character), and AGE (numeric).
The end; statement marks the end of the loop.
The datalines; statement indicates that the input data is provided in the following lines.
The input data is given as:
01 vivek 22
02 vital 25
03 rajes 20
From the input data, we can see that there are 3 observations and 3 variables (ID, NAME, AGE).
Therefore, the correct answer is:
C) 1 and 4