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Option 3 : Both II and III follow.

The least possible Venn diagram is given below:

[ alt="F1 V.B Madhu T.T.P 23.11.19 D5" src="//storage.googleapis.com/tb-img/production/19/11/F1_V.B_Madhu_T.T.P_23.11.19_D5.png" style="width: 287px; height: 114px;">

Conclusions:

Some tiger is cat → False (It is possible but, not defined hence, false).

Some dogs are animals → True (It is defined).

Some rats are cats → True (It is defined).

Hence, the correct answer is both II and III follow.

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