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How many bits in UDP's header?

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Website like Chegg say 64 bits but kurose and ross say it's 32 bits. In their book they have said each header is 2 bytes and there are four headers. So this makes it to 64 bits too. Is there an error in this diagram or am I missing something?
kurose and ross

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UDP header is 8 Byte
source port number, destination port number, total length, and checksum , each containing 2byte so total 64 bit or 8Byte
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