CS 215 : If you were to choose ?????

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If you were to choose between these implementation, which one would you employ for your PL (please support your choice with well founded basis): 1) Stack-dynamic variables vs. Implicit Heap Dynamic variables 2) for String implementation : unbounded w/ fixed allocation vs. unbounded with dynamic allocation 3) for fixing dangling pointers : Tombstones vs. lock-and-keys 4) solution for garbage : garbage collection vs. reference counters