Given below are two statements - one labelled Assertion (A) and the other Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

A teaching support system, traditional or modern, is set up to bring economy and to ensure quality in teaching-learning transactions, so the Assertion is correct.

Learning outcomes can match stipulated instructional goals only when learners are given scaffolds at the outset, so the Reason is correct.

Because scaffolds are exactly the support the system supplies to secure quality outcomes, the Reason explains why such a support system is put in place.

Scaffolding means temporary guided help that is gradually withdrawn as the learner gains competence.

Economy here means achieving the desired learning with the least waste of time, effort and resources.

The scaffolding metaphor comes from Bruner, built on Vygotsky's zone of proximal development.