In a B+ tree, the requirement of at least half-full (50%) node occupancy is relaxed for which one of the following cases?

Which of the following statements about a relation $R$ in first normal form (1NF) is/are TRUE?

Consider the following two relations, R(A, B) and S(A, C):

The total number of tuples obtained by evaluating the following expression

$$ \sigma_{B < C}(R \bowtie_{R.A = S.A} S) $$

is _________

The symbol → indicates functional dependency in the context of a relational database. Which of the following options is/are TRUE?