Which of the following are performance measures used by firms to assess their own performance in relation to suppliers?
i. Percentage of orders processed by electronic means
ii. Number of expedited orders
iii. Response time to customer queries
iv. Reduction in the number of suppliers

A) i, ii and iii
B) ii, iii and iv
C) i, ii and iv
D) All of the given answers

i. Percentage of orders processed by electronic means - This performance measure would help the firm to understand how much it is relying on traditional paper-based processes vs digital processes to interact with suppliers.
ii. Number of expedited orders - This measure would help the firm to understand how many times it had to expedite orders due to poor supplier performance.
iii. Reduction in the number of suppliers - This measure would help the firm to understand how many suppliers were performing poorly and had to be replaced.
Therefore, options i, ii, and iv are the correct options for performance measures used by firms to assess their own performance in relation to suppliers. Option iii is related to customer queries, so it is not directly relevant.