The endianess means how the data is stored in the memory. The address format is the same for liitle endian and big endian.
Big endian: Stores data big-end first. When looking at multiple bytes, the first byte (lowest address) is the biggest.
Little endian: Stores data little-end first. When looking at multiple bytes, the first byte is smallest.
For big-endian, the case 2 is correct.
Regards,
QJ