The sample-drawing procedure contains one or more sample-drawing items.

Sample-drawing items in the sample-drawing procedure (transaction QPV2) specify:

Number of Samples (B): Defines how many samples (e.g., 5 units) are drawn per item, a key field in the item details.

Sample Categories (D): Specifies the type (e.g., primary, reserve, pooled) for each sample-drawing item, a mandatory attribute.

Confirmation of Sample Drawing (A): Confirmation occurs in sample management (e.g., QPR2), not stored in the procedure item.

Sample Drawing Based on Number of Containers (C): This is a rule in the procedure header, not an item-specific detail.

Thus, "Number of samples" and "Sample categories" are the correct answers.References: SAP Help Portal - "Sample-Drawing Procedure"; SAP S/4HANA QM User Guide - "Sample Management".