Angular Deck#252/282PrevNextQuestion 252 of 282Medium#angular#dependency-injectionIs it mandatory to use injectable on every service class?by TimmoOct 7, 20260 viewsHelpful0SharePractice with AIShow Answer (Space)Self-rating (1 / 2):Needs ReviewMasteredMastered & NextPrevShowAIMasteredNextPrevious (#251/282)How do you configure injectors with providers at different levels?Next Question (#253/282)What is an optional dependency?Keyboard shortcuts: ← / → prev/next · Space toggle answer · 1 Mastered · 2 Needs Review.