4 Probem_ Heap vs. Stack Briefly address the following questions (2-3 sentences): 1. Why can we not dynamically allocate objects on the stack? That way, we would avoid having to deal with the heap. 2. Your language definition allows the runtime stack to contain at most one stack frame for each procedure at any point in time during program execution. Do you still need a runtime stack? 3. Could we change our runtime environment to allocate all stack frames on the heap? If yes, what are the advantages / disadvantages