A. `spark.read.jdbc("jdbc:mysql://localhost:3306/db", "table",properties)`

B. `sc.read.jdbc("jdbc:mysql://localhost:3306/db", "table",properties)`

C. `rdd.read.jdbc("jdbc:mysql://localhost:3306/db", "table",properties)`

D. `sqlContext.read.mysql("jdbc:mysql://localhost:3306/db", "table",properties)`