What needs to be added to the code to return a new RDD with all keys where the absolute difference between their keys and values is greater than $2?$

rdd $=$ sc$.$parallelize$([(1,2),(2,4),(3,6),(4,1)])$

# The results need to be a list of keys. In this case result $=[3,4]$

A$.$

rdd$1=$ rdd$.$map$($lambda x: $($x$,$ abs$($x$[0]-$ x$[1]))).$filter$($lambda x: x$[1]>2).$map$($lambda x: x$[0])$

B$.$

rdd$1=$ rdd$.$map$($lambda x: $($x$[0]-$ x$[1],$ x$)).$filter$($lambda x: x$[0]>2).$map$($lambda x: x$[1])$

C$.$

rdd$1=$ rdd$.$flatMap$($lambda x: $[($x$[0],$ i$)$ for i in x$[1]]).$filter$($lambda x: abs$($x$[0]-$ x$[1])>2).$map$($lambda x: $($x$[0],[$x$[1]])).$reduceByKey$($lambda x$,$ y: x $+$ y$).$flatMap$($lambda x: $[($x$[0],$ i$)$ for i in x$[1]])$

D$.$

rdd$1=$ rdd$.$map$($lambda x: $($x$,$ x$[0]-$ x$[1])).$filter$($lambda x: x$[1]>2).$map$($lambda x: x$[0])$