What is the correct answer?

Looks option A is correct one

A.Delegation

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Thanks for invitation

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Thanks for your question. Option A - Delegation.

Thx for the Invitation.

Option (A) is the answer.

Thanks for invitation,

I do agree with answer "A" as a correct answer.

Efficient use of support systems.

dear , 

the correct answer is A

regards

Thanks for invitation ..................... my answer is A

Option A is the answer ...thanks for invitation.....