Which of the following statements are TRUE? Check all that apply Group of answer choices Lifetime and scope of a variable always overlap since a variable that is live is always visible in all program units In all languages, the scope of a local variable starts at its declaration and ends where the block ends Non$-$local variable scope could be created either by the language nested structures such as subprograms, blocks, or classes, or by creating global variables defined outside of any such units A variable is non$-$local if it is visible inside a program unit or block but it is declared somewhere else in the program In some languages, variable scope is defined by a block, in which case a block is typically stack$-$dynamic