Tracing a while loop

Consider the following snippet of code.

upper_bound = 10
num = 2
while num < upper_bound:    # line A
    num *= 2                # line B

## How many times is line A executed and how many times is line B executed? Try to trace through this on your own, but if you get stuck, try [using Python Tutor](https://pythontutor.com/visualize.html#mode=display). 1. [ ] A: 3, B: 3 2. [ ] A: 3, B: 4 3. [x] A: 4, B: 3 4. [ ] A: 4, B: 4