A developer for a company is tasked with creating a program that will allow customers to update their billing and shipping information. The billing address field used is limited to 50 characters…

Using a single equals sign is an assignment operation in most languages rather than a comparison, and even as a comparison it only permits input of exactly 50 characters, rejecting all valid shorter inputs.

The not-equal condition (`!= 50`) accepts any length other than exactly 50, meaning it would allow arbitrarily long strings that overflow the buffer.

The greater-than-or-equal condition (`>= 50`) allows input of 50 characters or more, which permits overflow for any input exceeding the 50-character field limit.

Using `if (billingAddress <= 50)` ensures the input is accepted only when its length is within the allocated 50-character buffer, rejecting anything longer. This bounds check prevents writing beyond the buffer boundary, which is the root cause of buffer overflow vulnerabilities.