Pop quiz: what is efficient

In the context of this course, what is meant by efficient Python code?

50 XP

Code that executes quickly for the task at hand, minimizes the memory footprint and follows Python's coding style principles.
press1
Code that has a fast runtime, consumes a small amount of memory and can be verbose/hard to interpret (readability doesn't matter).
press2
Code that returns a correct result regardless of the execution time and resource consumption.
press3