Pipeline 2 fails because the $divide operator only supports numeric types
Again, this question of context. Is the question is about the success or failure of the pipeline 2 or the requirements for a valid divide command.
So how can you tell if it fails or not, if you don’t know the data type of $a. If you ask the question
the $divide operator only supports numeric types
That is a different question, and I would like to see added to the end, “or valid expressions which resolve to a number.”
I had this issue with the ambiguity of questions on other courses, and given English is my first language, I have some sympathy, for those where is it is 2nd or 3rd.