Aggregation pipeline was introduced in MongoDB version ______.
A. 2.1
B. 2.2
C. 2.4
D. 3.0
Answer:A
Aggregation pipeline was introduced in MongoDB version ______.
A. 2.1 B. 2.2 C. 2.4 D. 3.0
Explanation:The aggregation pipeline provides an alternative to map-reduce. 2. Point out the wrong statement :