Answer:
The answer is option C.
Step-by-step explanation:
The main reversal of a harmony is the voicing of a set of three, seventh harmony, or ninth harmony with the third of the harmony in the bass and the root a 6th above it. The group of three framework is the manner in which National Grid charges organizations for the expense of the transmission arrange. By lessening load and expanding age when national interest is at its most astounding, clients can spare or acquire cash. Group of three administration is a troublesome procedure.