What characterizes a non-Archimedean absolute value?
It satisfies ∣x+y∣≤∣x∣+∣y∣|x + y| \leq |x| + |y|∣x+y∣≤∣x∣+∣y∣
It satisfies ∣x+y∣≤max(∣x∣,∣y∣)|x + y| \leq \max(|x|, |y|)∣x+y∣≤max(∣x∣,∣y∣) (ultrametric)
It is always less than the standard absolute value
It applies only to complex numbers