Match the logic gates in column A with their equivalents in column B.

The Boolean function realized by the logic circuit shown is

Assuming that all flip-flops are in reset condition initially, the count sequence observed at Q_A in the circuit shown is

If $$\overrightarrow{\mathrm A}\;=\;\mathrm{xy}\;{\widehat{\mathrm a}}_\mathrm x\;+\;\mathrm x^2\;{\widehat{\mathrm a}}_\mathrm y$$ then $$\oint\overrightarrow{\mathrm A}.\overrightarrow{\mathrm d}\mathcal l$$ over the path shown in the figure is