Which command adds a new column named "category" to a table named "items" and set its default value to 'Uncategorized'? Question $20$Answer a$.$ ALTER TABLE items ADD COLUMN category VARCHAR$(50)$ DEFAULT 'Uncategorized' b$.$ Alter COLUMN category TO items DEFAULT 'Uncategorized' c$.$ MODIFY TABLE items ADD category VARCHAR$(50)$ DEFAULT 'Uncategorized' d$.$ INSERT INTO items $($category$)$ VALUES $(\text{'}$Uncategorized$\text{'})$