In nodal analysis, the number of independent nodes for which KCL equations are written is equal to:

Phasor analysis is applicable only when the circuit is operating under ____________.

In a given DC circuit branch, three currents satisfy Kirchhoff's laws such that i1 enters a node, i2 leaves the node with a value of -1 A, and i3 leaves the node. If the verified calculation yields i1 = 20 A, i2 = -1 A, and i3 = 21 A, select the option that correctly represents these values.