If f(x) = |x – 2| + |x + 2|, x ∈ R, then
(a) f(x) = {(-2x if x ∈ (-∞,-2]),(4 if x ∈ (-2,2]),(2x if x ∈ (2,∞))
(b) f(x) = {(2x if x ∈ (-∞,-2]),(4 if x ∈ (-2,2]),(-2x if x ∈ (2,∞))
(c) f(x) = {(-2x if x ∈ (-∞,-2]),(-4x if x ∈ (-2,2]),(2x if x ∈ (2,∞))
(d) f(x) = {(-2x if x ∈ (-∞,-2]),(2x if x ∈ (-2,2]),(2x if x ∈ (2,∞))