In Meselson and Stahl's experiment,what kind of DNA molecules would be found after four replication cycles?

A)Only heavy DNA (¹⁵N-¹⁵N)
B)Only intermediate DNA (¹⁵N-¹⁴N)
C)Only light DNA (¹⁴N-¹⁴N)
D)Both heavy (¹⁵N-¹⁵N)and light DNA (¹⁴N-¹⁴N)
E)Both heavy (¹⁵N-¹⁵N)and intermediate DNA (¹⁵N-¹⁴N)