What is the difference between spear phishing and whaling?

What is the difference between spear phishing and whaling?
A . There is no difference. Both are targeted phishing.
B . Spear phishing focuses on voice services and whaling is primarily sent through SMS messages.
C . Both are targeted phishing, but only whaling targets individuals in executive positions.
D . Spear phishing involves email, and whaling involves DNS cache poisoning.

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Answer: C