If a = f (- 1), B = f (log0.51 / 4), C = f (lg0.5), then what is the size relationship among a, B, C

If a = f (- 1), B = f (log0.51 / 4), C = f (lg0.5), then what is the size relationship among a, B, C

Because it's an even function
So a = f (- 1) = f (1),
b=f(log0.5 1/4)=f(log1/2 (1/2)^2)=f(2)
c=f(lg0.5) =f(lg1/2)=f(-lg2) =f(lg2)
Because f (x) decreases monotonically on [0,2]
f(2)>f(1)>f(lg2)
So c > a > b