GA (j ), GB (j ) and GC (j ) are three transfer function whose phase variations are shown in the given figure. The magnitude variation with respect to frequency is the same for both GA (j ) and GC (j ), but their phase variation is as indicated by the curves labelled A and C in the given figure. The transfer function GB (j ) is such that C (j ) = A (j ) + B (j )GA, GB and GC are respectively

• A. minimum phase, all pass and non-minimum phase functions
• B. minimum phase, non-minimum phase and all pass functions
• C. all pass, minimum phase and non-minimum phase functions
• D. all pass, non-minimum phase and minimum phase functions.