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Which of the following modes does not implement chaining or “dependency on previous stage computations”?

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Which of the following modes does not implement chaining or “dependency on previous stage computations”?

(a) CTR, ECB

(b) CTR, CFB

(c) CFB, OFB

(d) ECB, OFB

This question was posed to me in an international level competition.

The above asked question is from DES Modes of Operation topic in division Advanced Encryption Algorithm and Block Cipher Operation of Cryptograph & Network Security

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The correct choice is (a) CTR, ECB

To explain I would say: Only CTR and ECB do not implement chaining.

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