Final answer:
The output of the code will be the number 4 followed by an IndexError, because lists in Python are zero-indexed and my_jumble has no element at index 4.
Step-by-step explanation:
The code provided is a small Python script. It first declares a list called my_jumble with four elements: three strings and an integer. The function len() is then called to find the number of elements in the list, which is 4. The next line attempts to print the element at index 4 in the list. However, in Python, list indexing starts at 0, so the last element is at index 3 in this case. Trying to access my_jumble[4] will lead to an IndexError because there is no element at that index. Therefore, the correct answer is (a) 4, IndexError.