输入序列ABCABC经过栈操作变成ABCCBA,下面哪些是可能的栈操作( )A、push pop push pop push pop pushpush push pop pop pop //ABCCBAB、push push push push push push poppop pop pop pop pop //CBACBAC、push push push pop pop pop pushpush pop pop push pop //CBABACD、push push push push pop pushpop push pop pop pop pop //ABCCBA