Tail recursion Pick ONE option Occurs when the recursive call is the last statement executed in a recursive procedure or function $3$ is a path that includes a recursive call to the routine, to solve a smaller version of the original problem $4$ is a structure that keeps track of the activation records at run time in order to preserve the value of parameters, return addresses registers and so no refers to the point in the compile$/$execution cycle when variable names are associated with addresses in memory