Which Apache project provides a real-time stream processing framework for handling and analyzing data streams in real-time?

What is the primary characteristic of "big data"?

A. Small volume of data

B. High velocity of data

C. Variety of data sources

D. Low complexity of data

In the context of big data, what does the "3Vs" represent?

A. Velocity, Value, Variability

B. Volume, Variety, Velocity

C. Volume, Value, Variety

D. Velocity, Veracity, Variety

Which programming framework is commonly used for processing large-scale data in a distributed computing environment?

A. Java

B. Python

C. Hadoop

D. SQL

What is the main purpose of the Hadoop Distributed File System (HDFS) in a Hadoop ecosystem?

A. Real-time data processing

B. Data storage and retrieval

C. Data visualization

D. Data encryption