There is a close relationship between resilience and sustainability. However, there is some uncertainty surrounding the nature of this relationship. Some researchers consider resilience a prerequisite for sustainability, while others have defined resilience equivalent to sustainability, and then there are those who find resilience inadequate for attaining sustainability.

How do you explain the relationship between resilience and sustainability? 

a) Contrast these concepts and 

b) examine whether these two terms are synonymous, complementary, or in conflict (with analysis).