Choose the statement that is not correct for Scala's mutable.Map?

The map method on List (and Seq), transforms each element of a collection based on a function. For example, if we have a List[String] and want to convert it to all lowercase?

What is the output?

Which one is not valid using List?

How can you make a List[String] from a given val x = List[List[String]]?

Result using the following code?

Choose the expression that allows the code to compile

For given code, Choose correct statement which explains the error?

Choose description that describes the Scala classes 'scala.AnyRef ' and 'scala.AnyVal'?

Result using the following code?

How can you make a List[String] from a given val x = List[List[String]]?