What is the syntax for indexing a key in a dictionary?

The syntax for indexing a key in a dictionary is accurately demonstrated by the choice that uses square brackets. When you access a value associated with a specific key in a Python dictionary, you utilize the dictionary name followed by the key enclosed in square brackets. This allows you to retrieve the value directly linked to that particular key.

For instance, if you have a dictionary called my_dict and you want to access the value associated with the key name, you would write my_dict['name']. This syntax retrieves the corresponding value if the key exists in the dictionary. If the key does not exist, it raises a KeyError.

Although other options might involve valid operations with dictionaries, they do not adhere to the standard method of accessing a value by its key. One option uses the dot notation, which is not applicable for dictionary key access, while another one uses the get() method, which is also a valid approach but not the direct indexing method. Lastly, checking the presence of a key in the dictionary with the in keyword does not serve to access the value associated with that key.