At each replication fork, one new strand of dna is made of many small pieces. what is this strand of dna called? lagging strand origin strand leading strand bubble strand

DNA replication is the copying of a cell's DNA.One of the key molecules in DNA replication is the enzyme DNA polymerase. 
Each strand in the double helix acts as a template for synthesis of a new, complementary strand.The lagging strand of DNA is made of many small pieces.