多选题

下面选项中t是s的子序列的是（）

Question

A. s=<{2,4},{3,5,6},{8}> t=<{2},{3,6},{8}>

B. s=<{2,4},{3,5,6},{8}> t=<{2},{8}>

C. s=<{1,2},{3,4}> t=<{1},{3}>

D. s=<{2,4},{2,4}> t=<{2},{4}>