:Which choice is a best fix to the errors in the following statement

always @$($posedge clk or negedge reset$)$

always @$($posedge clk and posedge reset$).$a O

always @$($posedge clk and negedge reset$).$b O

always @$($posedge clk$,$ or negedge reset$).$c O

There are no errors in this statement $.$d O