Explanation:

- Option 1: Ineffective

A contract deemed "ineffective" suggests it lacks enforceability but doesn't necessarily address legality from the outset.

- Option 2: Valid

A valid contract is legally binding and enforceable from the start. Contracts with an enemy alien during war can't be valid due to legal constraints.

- Option 3: Voidable

A voidable contract is initially valid but can be rejected by one party for certain legal reasons. This doesn't apply broadly to contracts with an enemy alien.

- Option 4: Void-ab-initio

A contract that's "void-ab-initio" is null from the beginning, meaning it's treated as if it never existed. Contracts with alien enemies during war are considered void-ab-initio as they're illegal from the start.

Correct Answer