A company decides they want to create a product to solve the problem of making iced coffee efficiently without ruining it$.$ They design a product by taking these steps:

$1.$ Observing coffee$-$drinkers and talking to people who drink coffee in focus groups and interviews to find out what their coffee$-$drinking habits and needs are.

$2.$ Compiling reports based on their observations$/$interviews$,$ creating personas for their users, and identifying the main pain points in their users coffee routines.

$3.$ Brainstorming as a team to come up with an initial system of concepts to solve the problem, using the insights from step $2.$

$4.$ Creating a prototype device that makes iced coffee $($implementing the design from step $3).$

$5.$ Testing the prototype by distributing it to $($and gathering feedback from$)$ their users in focus groups. After gathering feedback, they compile the usability problems they found, update their reports$/$personas$,$ and repeat steps $3,4$ and $5.$

What has this company demonstrated in this scenario?

Group of answer choices

Feedback study

Montessori method

Test$-$Driven Development

Design Thinking