The correct answer is: D. Expected standard, ideal standard and current standard
An expected standard is a level of performance that is considered to be achievable. It is based on what is considered to be good practice in the industry. An ideal standard is a level of performance that is considered to be the best possible. It is based on what is considered to be the best practice in the industry. A current standard is the level of performance that is actually being achieved. It is based on what is actually being done in the industry.
Option A is incorrect because it does not include an ideal standard. Option B is incorrect because it does not include an expected standard. Option C is incorrect because it does not include a current standard.