Which of the following statements is true?

• a.)
• In a standard normal distribution, the mean is equal to 0 and the standard deviation is equal to 2.
• b.)
• In a standard normal distribution, the mean is equal to 1 and the standard deviation is equal to 2.
• c.)
• In a standard normal distribution, the mean is equal to 1 and the standard deviation is equal to 1.
• d.)
• In a standard normal distribution, the mean is equal to 0 and the standard deviation is equal to 1.