Select the statement that best defines column-centric storage? a. Column-centric storage is a physical data storage technique in which data is stored in blocks, which hold data from a single column across many rows b.Column-centric storage is a logical data storage technique in which data is stored in blocks, which hold data from a single column across many rows. Oc Column-centric storage is a physical data storage technique in which data is stored in blocks, which hold data from a single row across many columns O d.Column-centric storage is a logical data storage technique in which data is stored in blocks, which hold data from a single row across many columns Select the statement that best defines row-centric storage? a. Row-Centric storage is a logical data storage technique in which data is stored in blocks, which hold data from all columns of a given set of rows b. Row-Centric storage is a local data storage technique in which data is stored in blocks, which hold data from all rows of a given set of columns OcRow.Centric storage is a physical data storage technique in which data is stored in blocks, which hold data from all rows of a given set of columns d. Row.Centric storage is a physical data storage technique in which data is stored in blocks, which hold data from all columns of a given set of rows MapReduce is the computing framework used to process large data sets across clusters. Which of the following are valid components of MapReduce frameworks? a. Map, Mapper, Reduce, and Reducer. b. Map, Mapping Reduce, and Reducing C. Mapper, Mapping Reduce, and Reducing. d. Mapper, Mapping, Reduce, and Reducer. What does the acronym ETL stands for? a. Extract, Transfer, and Load O b. Extract, Transform, and Load O c. Export, Transform, and Load O d. Export, Transfer, and Load Which of the following is not a data visualization technique? a. A job tracker is a central control program used to accept, distribute, monitor, and report on MapReduce processing Jobs in a Hadoop environment. b. Atask tracker is a central control program used to accept, distribute, monitor, and report on MapReduce processing jobs in a Hadoop environment c. Ajob tracker is a program in the MapReduce framework responsible to running mapper and reducer tasks on a node. d. A ask tracker is a program in the MapReduce framework responsible to rupning mapper and reducer tasks on a node