QUESTION 23 Which of the following is true of running a Spark application on Hadoop YARN? O A. Irrespective of the mode, the driver is launched the client process that submitted the job OB. Running in Hadoop YARN has the advantage of having multiple users running the Spark interactive shell O C. There are two deploy modes that can be used to launch Spark applications on YARN - client mode and cluster mode O D. In Hadoop YARN mode, the RDDS and variables are always in the same memory space QUESTION 24 An existing RDD, unhcrRDD contains refugee data from the UNHCR. It contains the following fields: (Country of residence, Country of origin, Year, Number of refugees). Sample data is shown below. Assume that number of refugees is of type int and all other values are of type String. Array (Array (Afghanistan, Pakistan, 2013, 34), Array (Albania, Algeria, 2013, 0), Array (Albania, China, 2013, 12)...). To get the count of all refugees by country of residence, use which of the following in Python? O A. country = unhcrRDD.map(lambda x: (x(0), x(3))).reduceByKey(lambda v1, v2: v1 + v2) O B. country = unhcrRDD.map(lambda x: x.parallelize()) OC. country = unhcrRDD.map(lambda x: x.parallelize()).reduceByKey(lambda v1, v2: v1 + v2) O D. country = unhcrRDD.map(lambda x: x(0),1)).reduceByKey(lambda v1, v2: v1 + v2)