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What is the GCD of the numbers \(3, a,\) and \(12,\) if \(a\) is an integer and \(a \ge 3?\)

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What is the GCD of the numbers \(3, a,\) and \(12,\) if \(a\) is an integer and \(a \ge 3?\)

1. \(a\) is a prime number greater than \(2.\)
2. Both \(gcd(3, a)\) and \(lcm(3, a)\) are factors of the number \(30.\)

[spoiler]OA=E[/spoiler]

Source: e-GMAT
Source: — Data Sufficiency |