how can you find the first occurrence of a three in an array? assume that you have previously imported the…

Brief Explanations:

In Python's array module, to find the first occurrence index of an element (in this case 3) in an array named arr, the correct syntax is arr.index(3). The second option arr.index[3] has incorrect syntax for accessing an index - it's not how indexing works for finding an element's position. The third option index(arr, 3) is not a valid built - in way to find the index of an element in an array in the context of the imported array module.

Answer:

arr.index(3)