Two resistances are expressed as $R_1=(4\pm0.5) \Omega$ and $R_2=(12 \pm 0.5) \Omega$. what is the net resistance when they are connected 1) series 2) in parallel, with percentage error ?

Question

$$(a)\;16 \Omega \pm 23 \%  ,3 \Omega \pm 6.25 \%$$ $$(b)\;3 \Omega \pm 2.3 \%,3 \Omega \pm 6.25 \%$$ $$(c)\;3 \Omega \pm 23 \%,16 \Omega \pm 6.25 \%$$ $$(d)\;16 \Omega \pm 6.25 \%,3 \Omega \pm 23 \%$$