The correct answer is B. Phishing campaigns within an organization are typically conducted to train and evaluate employees on their ability to recognize and respond to malicious social engineering attempts. It helps to raise awareness and prepare them for real-life scenarios. Option A is incorrect because the elimination of spam is an email filtering task, not the goal of a phishing campaign. Option C is incorrect because improving network performance is not related to phishing campaigns. Phishing campaigns are focused on user behavior rather than technical network improvements. Option D is incorrect as a phishing campaign is not designed to deploy software on the network but is rather a form of security training and assessment.