Which of the following is an open-source program that implements mapreduce?

Apache Hadoop.

Explanation:

Apache Hadoop is a open source program that uses map reduce programming process to allocate storage and processing of big data computation. It uses a network of computers, distributing and processing large data, for parallel computation.

The Apache Hadoop has two main parts, the Hadoop distributed file system and the MapReduce model. The Hadoop distributed file system divides large chunks of data into clusters and pass them to the MapReduce model, where they are separated to similar data types.

Apache Hadoop

Apache Hadoop is a collection of open-source software utilities that facilitate using a network of many computers to solve problems involving massive amounts of data and computation. It provides a software framework for distributed storage and processing of big data using the MapReduce programming model.

b. xor is the correct answer

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