Comprehensive and Detailed Explanation:
When a buyer selects a single supplier for a specific period, such as a one-year contract, and excludes other suppliers during this time, this is referred to as asingle sourcedrelationship. This approach is often used to consolidate purchases, achieve economies of scale, and build a more streamlined procurement process for specific goods or services.
Reference:
"Single sourcing involves selecting one supplier for a particular item or service, often for a defined period, to streamline procurement and potentially achieve better terms."- CIPS L4M6 Study Guide

This is 'cost focus' - Kinky Boots is both focusing on being a cost leaser (by providing the cheapest products) and focusing on a niche market (drag queens). When these two strategies are combined it is called 'cost focus'.
There's a couple of questions on Porter's Generic Strategies in the exam- there's a useful diagram of this on P.
13

The correct answer is "A mechanism for performance management where the buyer has the right to deduct money from payments owed for under performance". A definition is provided on p.113 and states "If a supplier fails to meet the standard set in the service credits, the buyer has the right to deduct set amounts of money from payments owed to the supplier"

Open Tender processes are a one-stage process which issues and ITT. It has no PQQ (selection) stage. P. 77

Comprehensive and Detailed Explanation:
In Michael Porter's Value Chain model, primary activities are those that are directly involved in the creation and delivery of a product or service. These include:
* Inbound Logistics:Activities related to receiving, storing, and distributing inputs internally.
* Operations:Transforming inputs into the final product.
* Outbound Logistics:Distributing the final product to customers.
* Marketing and Sales:Activities that inform buyers about products and services, induce buyers to purchase them, and facilitate their purchase.
* Service:Activities that maintain and enhance the product's value, such as customer support and repair services.
Firm infrastructure and technology development are considered support activities, as they assist the primary activities in helping the organization achieve its competitive advantage.
Reference:
CIPS L4M6 Study Guide