请根据运行结果将代码空白处填上合适的选项？（ ）
代码:
num1=1
while num1 <= 5:
num2=1
while num2 <= 5:
___________
num2 += 1
print()
num1 += 1
运行结果:
1 1 1 1 1
2 2 2 2 2
3 3 3 3 3
4 4 4 4 4
5 5 5 5 5
print(num2,end="")
print(num2,end =" ")
print(num1)
print(num1,end =" ")
