Are emails informal?

What is the right answer for this? I thought an email from CEO is formal, but the answer suggested it is INFORMAL.

Is that a PMI thinking?

One of your projects was delivered late, and in turn, it resulted in a loss of $1 million. CEO made some reforms to make sure the work is delivered on time. The CEO office sent it a memo to make sure people are adhering to it. What type of communication did the CEO send?

A. Formal

B. Informal

C. Unofficial

D. External

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