In which method used in cryptanalysis does the attacker know a portion of the plaintext and the corresponding ciphertext?

In which method used in cryptanalysis does the attacker know a portion of the plaintext and the corresponding ciphertext?​

• meet-in-the-middle
• brute-force
• chosen-plaintext​
• ciphertext

Explanation: There are several methods used in cryptanalysis:
Brute-force - The attacker tries every possible key knowing that eventually one of them will work.
Ciphertext - The attacker has the ciphertext of several messages encrypted but no knowledge of the underlying plaintext.
Known-Plaintext - The attacker has access to the ciphertext of several messages and knows something about the plaintext underlying that ciphertext.
Chosen-Plaintext - The attacker chooses which data the encryption device encrypts and observes the ciphertext output.
Chosen-Ciphertext - The attacker can choose different ciphertext to be decrypted and has access to the decrypted plaintext.
Meet-in-the-Middle - The attacker knows a portion of the plaintext and the corresponding ciphertext.​

Exam with this question: Modules 15 - 17: Cryptography Group Exam Answers