How is informal learning at work different from formal training?

Correct answer: It can happen naturally through experience observation and practice

The direct answer is option A. Informal learning is learning that develops naturally while doing work. A worker may watch an experienced person, try the task, make small mistakes, receive guidance and improve through repeated practice. It may happen without a fixed classroom, syllabus, examination or certificate. Option A is correct because experience, observation and practice are central ways of informal learning. Option B is wrong because a certificate examination belongs more to formal or organised training, and informal learning does not always require one. Option C is wrong because informal learning can happen at a workplace, in a home, in a community or in daily life, not only in school. Option D is wrong because learning from work and experience is a genuine form of learning. The exam cue is: observation plus practice plus experience usually indicates informal learning.