In the context of IT outsourcing evolution, how does cloud computing primarily differ from traditional outsourcing models?A$)$ Cloud computing typically involves longer contract terms than traditional outsourcingB$)$ Cloud computing offers more rigid resource allocation compared to traditional modelsC$)$ Traditional outsourcing provides more on$-$demand scalability than cloud computingD$)$ Cloud computing enables more flexible, pay$-$as$-$you$-$go services compared to traditional outsourcing