Which of the following lines of code is a correctly formatted block with an if statement?
a. if x > 0:
print("Positive number")
print("Checked number")
b. if x > 0:
print("Positive number")
print("Checked number")
c. if x > 0:
print("Positive number")
print("Checked number")
d. if x > 0:
print("Positive number")