According to best practices, how should the PIN value be collected?

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An Alexa Skill Builder is creating a skill that requires the user to authenticate by speaking a PIN before an order status can be retrieved.

According to best practices, how should the PIN value be collected?
A . UseAMAZO
B . SearchQuery
C . UseAMAZO
D . FOUR_DIGIT_NUMBER
E . Use multiple slots of typeAMAZO
F . NUMBER
G . Use a custom slot with zero to nine as values.

Answer: D