Which of the following is the correct sequence of steps to adapt a WordPress plugin to a multisite?

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Which of the following is the correct sequence of steps to adapt a WordPress plugin to a multisite?
Answers:
1.      1. Use $wpdb to iterate through all blogs 2. Hook according to the $blog_id 3. Install the plugin as Network only 4. Uninstall depends the specific plugin
2.      1. Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. IInstall the plugin as Network only 4. Uninstall depends the specific plugin
3.      1. Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. Install other activations except Network 4. Uninstall is the same for all the plugins

4.      1. Use $wp_posts to iterate through all blogs 2. Hook according to the $function 3. Install the plugin as Network only 4. Uninstall is same for all the plugins
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.