Why is this not correct?

Question

I was attempting the Module 1 quiz in the Data Science Course, and came across this weird question. (it was the last question in that quiz)

The question was:
Which of the following commands is to multiply the first row of a 2d array 'arr' by 3:

The options were:
1. arr[0 , : ]*3
2. arr[ : , 0]*3
3. arr[0] * 3

I selected option 3, and Sololearn says that it it incorrect, and that the correct answer is actually option 1

However, when I run that in python, both of those perform the exact same operation.
Did the author mess up, or am I mistaken in some concept?