4. Write a C program to simulate deposit/withdraw activities on a banking account. (Hint: you might want to review Lab 3 slides.) (25 points) Declare the balance as a global variable and initialize it to 600 Write two functions, one for withdraw, the other for deposit. Both withdraw and deposit functions have one parameter, which represent the amount to withdraw or deposit. The functions deduct the balance and add to the balance one dollar at a time, respectively. Therefore, to withdraw 600 thousands, for example, the withdraw function has to execute a loop with 600 thousand iterations. The deposit function works in the same way, in the reverse direction. Create two Posix threads in main0. which call the withdraw and the deposit function respectively . . Use pthread mutex lock) and pthread mutex unlockO functions to ensure mutual exclusion between the two threads. Also make sure to use pthread join) to wait for the threads to terminate Be sure to document your program. Documentation should include: (1) The name of the author of the program (your name) and the date it was written, (2) a concise description of what the program does, (3) a clear description of its limitations if it does not meet all specifications, and (4) comments of critical code and data declarations. The same should also be done for each function written in the program. ou'll lose some points if the above documentation is missin