Why the answer is length ?

Question

test. (length)

Answer 1

the answer of what?

Answer 2

explain your question.

Answer 3

are u asking yourself a quastion which nobody can understand even u??

Answer 4

actualy he was here in a test:

"Fill in the blanks to retrieve the number of elements in an array called "test". "
test.____
And he was wondering why is the corect answer "length"