Spark - how the solve the below question

Question

va1 alphabetRdd1 = sc.parallelize(list(("a",1),("b",2),("c",3)))

sc.parallelize(list(("b","second"),("c","third"),("d","fourth")))

va1 leftouterjoinRdd = alphabetRdd1.leftouterjoin(alphabetRdd2)

leftouterjoinRdd.collect().foreach(println)

a. (a,(1,none))

    (b,(2,some(second)))

    (c,(3,some(third)))

b. (b,((second)))

    (c,((third)))

c. (a,(1))

    (c,(3,some(third)))

d. run time error

Answer 1

option d,

Runtime error