Mark the correct alternative in each of the following:
Which of the following functions from A = {x ϵ R : –1 ≤ x ≤ 1} to itself are bijections?
Given that A = {x : –1 ≤ x ≤ 1}
a. f(x)=|x|
It is not one-one because f(-1)=1 and f(1)=1.
b. 
It is bijective as it is one-one and onto with range [-1, 1].
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