The document titled "Patch Management in the IACS Environment" corresponds to IEC TR 62443-2-3, which belongs to the Policies and Procedures category of the ISA/IEC 62443 series.
IEC TR 62443-2-3 is a technical report providing guidance for managing software updates and patches in IACS environments without disrupting critical operations.
From the IEC 62443 document structure:
"The -2-x family of documents focuses on policies and procedures, especially in relation to the asset owner responsibilities within a CSMS (Cyber Security Management System)." IEC TR 62443-2-3 specifically describes:
"Recommended practices for planning and executing the patch management process for industrial control systems in a structured and secure manner." Incorrect Options:
A). System - System-level requirements are found in 62443-3-x.
B). General - General documents include 62443-1-x, focused on terminology and concepts.
C). Component - Component requirements are covered in 62443-4-x documents.
References:
IEC TR 62443-2-3:2015 - "Patch Management in the IACS Environment"
ISA/IEC 62443 Study Guide

The 2024 Second Edition of ISA/IEC 62443-2-1 was restructured to eliminate redundancy with ISO/IEC
27001 and to focus on aspects unique to IACS environments.
From ISA/IEC 62443-2-1:2024 Preface:
"The second edition removes duplication with ISO/IEC 27001 and instead focuses on IACS-specific considerations that complement an organization's overall ISMS." It still aligns with the Plan-Do-Check-Act (PDCA) model but no new framework was introduced - rather, clarity and applicability were improved.
Incorrect Options:
A). The PDCA model was retained, not newly introduced.
C). Supply chain security was actually emphasized, not removed.
D). The focus remains on system-wide security management, not just components.
References:
ISA/IEC 62443-2-1:2024 - "Establishing an IACS Security Program" (Second Edition) ISA/IEC 62443 Study Guide

The ISA/IEC 62443 standards series was originally developed by the International Society of Automation (ISA) and then adopted and published by the International Electrotechnical Commission (IEC) as the IEC
62443 series. The IEC is the primary international body responsible for the ongoing development, maintenance, and publication of these standards, which are recognized globally for IACS cybersecurity. ANSI is a US standards body, NIST is responsible for US federal cybersecurity frameworks, and ETSI develops telecommunications standards for Europe, but IEC is the correct answer here.
Reference: ISA/IEC 62443-1-1:2007, Foreword and Scope; IEC 62443 official documentation, www.iec.ch
/62443.

ISA/IEC 62443-3-2 focuses on the cybersecurity risk assessment process, including:
Identifying zones and conduits
Determining the Target Security Levels (SL-T)
Designing the IACS architecture based on risk-based zoning
"Part 3-2 defines a process for conducting cybersecurity risk assessments and designing system architectures that incorporate zones and conduits based on those risks."
- ISA/IEC 62443-3-2:2020, Clause 5 - Risk Assessment Process
This part bridges the gap between risk evaluation and technical implementation.
References:
ISA/IEC 62443-3-2:2020 - Clauses 5.2 to 5.5
ISA/IEC 62443-1-1 - Framework overview

A product supplier is defined in ISA/IEC 62443 as an entity that designs, develops, and delivers hardware or software components (e.g., embedded devices, software applications, or network components) for use in IACS environments.
"Product supplier: An organization that develops and provides hardware or software products to be integrated into an IACS, without necessarily performing integration or on-site services."
- ISA/IEC 62443-1-1:2007, Clause 3.3.34
Since the company manufactures embedded devices and network components but does not perform installation or maintenance, it fits the definition of a product supplier.
References:
ISA/IEC 62443-1-1 - Clause 3.3.34
ISA/IEC 62443-4-1 / 4-2 - Requirements for product suppliers