Consider a scenario where a software development team is transitioning to Test$-$Driven Development $($TDD$).$ Which of the following challenges is the team MOST likely to encounter during this transition?

Group of answer choices

Spending more time on designing the software's user interface due to TDD$.$

Needing to hire a larger team solely dedicated to writing test cases.

Overcoming the initial learning curve and investing time upfront in writing tests before the actual code.

Encountering frequent software crashes as TDD generally reduces software stability.