External failure activities A. seek to prevent defects in the products or services being produced. B inspect inputs and attributes of individual units of products or services to detect whether they conform to specifications or customer expectations. C. correct defective processes or products and services before they are delivered to customers. D. are activities required after defective products or services are delivered to customers.

D. are activities required after defective products or services are delivered to customers.

Explanation:

Six Sigma is a quality business management strategy which helps business organizations to improve the quality of processes, products and services by discovering and eliminating defects, variations or errors. It is a strategic business concept that was developed in 1986 by Motorola.

Under the six sigma approach, any process that doesn't provide customer satisfaction or causes challenges in an organisation's process should be eliminated from the system in order to produce quality products and services. It allows only 3.4 defective features for every million opportunities and as such expects processes to be defect free 99.99966 percent of the time.

The following activities are carried out in accordance with the Six Sigma model;

External failure activities are activities required after defective products or services are delivered to customers.

The other terminologies used in the manufacturing process includes;

- Prevention: seek to prevent defects in the products or services being produced.

- Appraisal: inspect inputs and attributes of individual units of products or services to detect whether they conform to specifications or customer expectations.

- Internal failure activities: correct defective processes or products and services before they are delivered to customers.