In order to show whether input string aabba belongs to PDA in the previous quest

Question

In order to show whether input string aabba belongs to PDA in the previous question, a PDA computation sequence (i.e. the sequence of Instantaneous Descriptors (ID) and the PDA instruction that caused each ID) is written as follows. The last step is missing. What is the last step?
<0, abbaa, $> Start
<0, abba, X$> Rule 1
<0, abb, XX$> Rule 2
<1, ab, X$> Rule 3
<1, a, $> Rule 5
___________________
A. <0, , X$> Rule 6.
B. <0, , X$> Rule 7
C. <2, , > Rule 4
D. <2, , > Rule 8

Explanation / Answer

Answer is D. <2, , > Rule 8

Because, This rule is stated by the Rule 8 of Standard PDA.

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