The following Ruby code throws an error. What is the problem?

medium📝 Debug Q14 of 15

Ruby - Arrays

arr = [5, 10, 15]
puts arr.first()
puts arr[-4]

ANegative index -4 is out of range and returns nil, no error

BMissing argument in first() causes error

CArray is empty, so first() fails

DSyntax error in calling first()

Step-by-Step Solution

Solution:

Step 1: Check arr.first() usage
first() can be called with or without parentheses; no error here.
Step 2: Analyze arr[-4]
Array has 3 elements, so index -4 is out of range and returns nil, which prints as empty line, no error.
Final Answer:
Negative index -4 is out of range and returns nil, no error -> Option A
Quick Check:
Out of range negative index returns nil [OK]

Quick Trick: Out of range negative index returns nil, no error [OK]

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