下列程序中。module counter1( out, cout, data, load, cin, clk);output [7:0] out;output cout;input [7:0] data;input load, cin, clk;reg [7:0] out;always @(posedge clk)beginif( load )out = data;elseout = out + cin;endassign cout= out & cin;endmoudle

A. 同步置数，上升沿触发
B. 同步置数，下降沿触发
C. 异步置数，上升沿触发
D. 异步置数，下降沿触发