To determine which bowlers have taken more than 500 wickets in Test Cricket, let`s analyze each option and the relevant information about the bowlers mentioned:

1. Wasim Akram: Wasim Akram, a former Pakistani cricketer, is widely regarded as one of the greatest fast bowlers in the history of the game. He is known for his swing bowling and exceptional skills with both the new and old ball. However, in terms of Test cricket, Akram took a total of 414 wickets in 104 matches.

2. Richard Hadlee: Richard Hadlee, a former New Zealand cricketer, is considered one of the finest all-rounders of his time. He was a fast bowler known for his accuracy and ability to swing the ball. In his Test career, Hadlee took 431 wickets in 86 matches.

3. Glenn McGrath: Glenn McGrath, an Australian cricket legend, is widely regarded as one of the greatest fast bowlers in the history of the game. He was known for his metronomic accuracy, relentless line and length, and ability to extract bounce from the pitch. In Test cricket, McGrath took a remarkable 563 wickets in 124 matches.

4. Courtney Walsh: Courtney Walsh, a former West Indian cricketer, is regarded as one of the greatest fast bowlers from the Caribbean. He had an illustrious career that spanned over 17 years. In Test cricket, Walsh took an impressive 519 wickets in 132 matches.

Considering the information provided, the bowlers who have taken more than 500 wickets in Test Cricket are:

- Glenn McGrath (563 wickets)

- Courtney Walsh (519 wickets)

Therefore, the correct answer is Option 2: 3 and 4 only.