以下哪些操作会导致随后执行select count(object_id) from demo.t1; 时会发生硬解析 A delete from demo.t1; B truncate table demo.t1; C exec dbms_stats.gather_table_stats('DEMO','T1',no_invalidate=>false); D alter system set deferred_segment_creation=false; E alter table demo.t1 modify(owner varchar2(20)); F comment on table demo.t1 is '';