Which item(s) make up a block header?

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Which item(s) make up a block header?
A . The hash of the Merkle root and the header of the previous block
B . The hash of every transaction in a specific block and the next block
C . The time stamp of the block and the genesis block hash
D . The hash of the previous block

Answer: D

Explanation:

Reference: https://www.cryptocompare.com/coins/guides/what-is-a-block-header-in-bitcoin/