Macbeth Act IV, Scene ill

MALCOLM: This tune goes manly.
Come, go we to the king; our power is ready;
Our lack is nothing but our leave; Macbeth
Is ripe for shaking, and the powers above
Put on their instruments. Receive what cheer you may:
The night is long that never finds the day.
Identify the structural element that this speech plays in Macbeth.
Oprologue/exposition
O falling action
Orising action
O climax