Answer:
I would pick D
Explanation:
I would pick D, because it sounds professional and business like.
A isn't very business lt is more of a causal way, and can be taken as rude if your boss was the phone
B. Isn't a bad choice but it doesn't sound as professional as D
C. This is to professional in my option. This almost sounds like a robot is speaking instead of a person.
D. Is the best option. It is professional but not to much that it sounds weird. It is also not to causal.
Hope this helps :)
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