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.

1. Both $[a]$ and $[r]$ are true and $[r]$ is the correct reason for $[a]$.
2. Both $[a]$ and $[r]$ are true but $[r]$ is not the correct reason for $[a]$.
3. Both $[a]$ and $[r]$ are false.
4. $[a]$ is false and $[r]$ is true.

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