Solving questions for civic and moral education

"our beloved Hon. President John Joseph Magufuli has passed away" after this statement all national flag started flying at a half-mast. Who has power to order the use of this national symbol?
A. Prime minister
B. Vice president
C. Speaker
D. The president
E. Chief secretary

I wait for your well elaborated answers

The one publicly announced the death.
B

Ahmad Abdurahman said:

The one publicly announced the death.
B

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Why give answer according to the question