Web servers must receive all updates via HTTP/S from the corporate network.
Web servers should only connect to preapproved corporate database servers.
And the subnet 10.0.2.10/32 falls within the 10.0.0.0/16 corporate network leading us to conclude that F is the only answer that fulfills that requirement.
Answers B, C, D, and E are all wrong because they are permitting the firewall to access the Internet or be accessed by the internet. This is a big No when you configure firewall rules.
Firewall do not need to access or be accessed by anybody besides pre-defined internal systems that are in charge of configuring and updating them.
So Only A and F are permittable answers in this case regardless of what conditions are stated.

Field masking should be implemented to authenticate employees who call in remotely by allowing the help desk staff to view partial information about employees, because field masking would:
Enable the help desk staff to verify the identity of the employees by asking them to provide some characters or digits from their data fields, such as their employee ID or email address.
Prevent the help desk staff from viewing the full information about employees, which may be considered sensitive and subject to privacy regulations or policies.
Reduce the risk of data leakage, theft, or misuse by limiting the exposure of sensitive data to only those who need it.

Explanation
Cipher feedback (CFB) is a mode of operation for block ciphers that allows them to encrypt streaming data.
CFB uses an initialization vector (IV) and a block cipher to generate a keystream that is XORed with the plaintext to produce the ciphertext. CFB has low latency because it can encrypt each byte or bit of plaintext as soon as it arrives, without waiting for a full block. CFB is suitable for streaming data because it does not require padding or block synchronization.
B: Cipher block chaining message authentication code (CBC-MAC) is a mode of operation for block ciphers that provides both encryption and authentication. CBC-MAC uses an IV and a block cipher to encrypt the plaintext and generate a MAC value that is appended to the ciphertext. CBC-MAC has high latency because it requires the entire message to be processed before generating the MAC value. CBC-MAC is not suitable for streaming data because it requires padding and block synchronization.
C: Cipher block chaining (CBC) is a mode of operation for block ciphers that provides encryption only. CBC uses an IV and a block cipher to encrypt each block of plaintext by XORing it with the previous ciphertext block. CBC has high latency because it requires a full block of plaintext before encryption. CBC is not suitable for streaming data because it requires padding and block synchronization.
D: Electronic codebook (ECB) is a mode of operation for block ciphers that provides encryption only. ECB uses a block cipher to encrypt each block of plaintext independently. ECB has low latency because it can encrypt each block of plaintext as soon as it arrives. However, ECB is not suitable for streaming data because it requires padding and block synchronization. Moreover, ECB is insecure because it does not use an IV and produces identical ciphertext blocks for identical plaintext blocks.