What needs to be added to the code to return a new RDD with all elements in uppercase?

rdd $=$ sc$.$parallelize$(["$apple$",$ "banana", "cherry", "date"$])$

# Add code here to return a new RDD with all elements in uppercase

rdd$1=$ rdd$.$upper$()$

rdd$1=$ rdd$.$map$($lambda x: x$.$upper$())$

rdd$1=$ rdd$.$filter$($lambda x: x$.$startswith$("$a$")).$map$($lambda x: x$.$upper$())$

rdd$1=$ rdd$.$map$($lambda x: x$[0].$upper$()+$ x$[1$:$])$