Final answer:
The provided reference material does not include information to definitively indicate which physical inventory indicator corresponds to a cycle of six counts per year.
Step-by-step explanation:
The physical inventory indicator that designates a cycle of six counts per year is not clearly defined in the provided reference material from Chapter 17 or Chapter 2. Inventory counts can be denoted by various coding systems in different organizations and the terminology or coding like 'A,' 'B,' 'C,' 'D,' etc. can have company-specific meanings. Therefore, without specific context or a defined key that correlates these indicators to counting frequencies, it is not possible to definitively provide an answer to this question.