Final answer:
Option B) 172.16.0.1 and Option D) 10.10.10.256 are valid IPv4 addresses.
Step-by-step explanation:
The valid IPv4 address options are B) 172.16.0.1 and D) 10.10.10.256.
Option A) 192.256.1.1 is not a valid IPv4 address because the maximum value for each octet in an IPv4 address is 255, so 256 is out of range.
Option C) 300.0.0.1 is also not a valid IPv4 address because the maximum value for each octet is 255, so 300 is out of range.