(define sum-of-divisors (lambda (n) (define sum-from-plus (lambda (low addend) (if (> low n) _________ _________ ))) (sum-from-plus 1 0)))Q: When does the process stop?
A: When low > n.
Notice that the name n, introduced in the body of sum-of-divisors, is available in the body of the internal (nested) procedure sum-from-plus.