In Program 13-2, presented earlier in this chapter, what is the base case of the message module?

123 4 5 6 7 Module main () // By passing the argument 5 to the message module, // we are telling it to display the message // five times. Call message (5) 723 End Module 8 9 10 11 12 13. End Module Module message (Integer times) If times > 0 Then Display "This is a recursive module. " Call message (times - 1) End If