Which three actions should you perform?

You have a dataset that has multiple blocks and only numeric variables.
You are computing in a local compute context.
You plan to lag a variable named x to create a new variable named x_lagged by using a transform function. You
will create a new element in the output of the function.
You need to minimize the number of missing values.
Which three actions should you perform? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.

A.
Assign a value to the first value of x_lagged in the current block.

B.
Use rxSet to store the last value of x_lagged in the current block.

C.
Use rxSet to store thelast value of x in the current block.

D.
Use rxGet to retrieve the first value of x in the next block to be processed.

E.
Use rxGet to retrieve a value stored in processing of the prior block.