Suppose a call center has a process for resolving customer complaints. There are several opportunities for defects to occur in this process. These are as follows:

A customer's call is not answered within $30$ seconds.

A customer's call is disconnected due to technical issues.

A customer's issue is not resolved in a single call.

Let's assume that $200$ calls were sampled in a day, and there were $25$ instances of defects in the customer complaint resolution process. Calculate the defects per million opportunities $($DPMO$).$

$43,000$

$41,667$

$42,000$

$23,000$