What should I use to store options for a single blog on a network site?

Answer is update_blog_option(). This is specific for each blog. If I used get_user_option() it would be different for each user. If I used get_site_option() it would be across all sites on the network.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)