The output of the reduce task is typically written to the FileSystem via . . . . . . . .

The correct answer is: A. outputcollector.collect

The output of the reduce task is typically written to the FileSystem via outputcollector.collect(). This method takes a list of key-value pairs as input and writes them to the specified file system.

The other options are incorrect because:

• outputcollector.get() returns the next key-value pair from the output collector.
• outputcollector.receive() registers a callback to be invoked when the next key-value pair is available from the output collector.
• outputcollector.put() adds a key-value pair to the output collector.