(C) Book Building
Book Building is a mechanism where, during the period the IPO is open, bids are collected from investors at various prices which are above or equal to the floor price.
Source: Chapter 3, Issue of Shares — 'What does price discovery through Book Building Process mean?'
The question directly quotes the textbook definition of Book Building. Examiners expect you to identify the correct term from the definition given. Remember: Book Building ≠ Fixed Price (where price is set in advance). In Book Building, the final price (Cut-Off Price) is discovered after bid closing.