Determine the correctness or otherwise of the following Assertion $[a]$ and the Reason $[r]$.
Assertion: Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions.
Reason: Accuracy depends on the power mismatch vector tolerance.
- Both $[a]$ and $[r]$ are true and $[r]$ is the correct reason for $[a]$.
- Both $[a]$ and $[r]$ are true but $[r]$ is not the correct reason for $[a]$.
- Both $[a]$ and $[r]$ are false.
- $[a]$ is false and $[r]$ is true.