$A$ circle has its equation in the form $x^2 + y^2 + 2x + 4y + 1 = 0$. Choose the correct coordinates of its centre and the right value of its radius from the following:
- ACentre $(-1, -2)$,radius $= 2$
- BCentre $(2, 1)$,radius $= 1$
- CCentre $(1, 2)$,radius $= 3$
- DCentre $(-1, 2)$,radius $= 2$
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