$\begin{array}{1 1}(a)\;O_2^+\text{ is paramagnetic and bond order greater than }O_2\\(b)\;O_2^+\text{ is diamagnetic and bond order less than }O_2 \\(c)\;O_2^+\text{ is paramagnetic and bond order less than }O_2\\(d)\;O_2^+\text{ is diamagnetic and bond order more than }O_2\end{array}$
