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【单选题】
已知时钟信号clkin的频率为50MHz的信号，下面clkout的频率为（ ）。module function(rst, clkin, clkout);input clkin, rst;output clkout;reg clkout;reg[2:0] cnt;always @(posedge clkin or negedge rst)begin if(!rst) begin cnt<=3'd0; clkout<=1'b0; end else if (cnt>=3'd4) begin cnt<=3'd0; clkout<=~clkout; end else cnt<=cnt+1'b1;endendmoduleA.
2.5 MHz
B.
20 MHz
C.
5 MHz
D.
10 MHz
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