Answer:
To mine a block successfully, the computed hash value must be less than or equal to the target difficulty value. Since the target difficulty value is 1075, a valid computed hash value must be less than or equal to 1075.
Therefore, the only valid computed hash value among the options provided is (d) 1067, which is less than 1075. The other options (a) 1079, (b) 1083, and (c) 1091 are all greater than 1075, which means they are not valid computed hash values for successful mining of the block.