The IPv4 header length is variable and is determined by the Header Length (IHL) field in the IPv4 header.
Minimum header size: 20 bytes (5 x 4B) → No options field.
Maximum header size: 60 bytes (15 x 4B) → Includes maximum options.
Option A (Incorrect - 64B): The maximum possible length of an IPv4 header is 60B, so 64B is not possible.
Option B (Correct - 20B): This is the standard IPv4 header size without options.
Option C (Correct - 60B): This is the maximum IPv4 header size with options.
Option D (Correct - 32B): This is a possible IPv4 header size with some options.
Thus, the correct answer is A (64B).
[Reference:Huawei HCIA-Datacom Official Documentation - IPv4 Header Format, , , ]
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