Super$-$Dense Coding

Following is the super$-$dense coding quantum circuit.

a$)$ Write down the equation of above quantum circuit $($equation should include $H,U,$CNOT or any other required operation$/$gate$($s$)).$

b$)$ If unitary gate$-$U is a Pauli X $-$gate, find the meters reading $($output$)$ of the quantum circuit $($Show output at each stage of the circuit$).$

c$)$ If unitary gate$-$U is a Pauli ZX$-$gate, find the meters reading $($output$)$ of the quantum circuit $($Show output after U$/$ZX$-$gate of the circuit$).$