The following diagram represents a spatial index. Each letter represents an MBR$.$

A spatial index with three index levels.

The top level has one block with MBRs X and Y$.$

The middle level has two blocks. The first block has MBRs P$,$ Q$,$ and R$.$ The second block has MBRs S and T$.$

The bottom level has five blocks. The first block has MBRs A$,$ B$,$ and C$.$ The second block has MBRs D and E$.$ The third block has MBRs F and G$.$ The fourth block has MBRs H and I. The fifth block has MBRs J$,$ K$,$ and L$.$

Top level X points to the middle level block with P$,$ Q$,$ and R$.$

Top level Y points to the middle level block with S and T$.$

Middle level P points to the bottom level block with A$,$ B$,$ and C$.$

Middle level Q points to the bottom level block with D and E$.$

Middle level R points to the bottom level block with F and G$.$

Middle level S points to the bottom level block with H and I.

Middle level T points to the bottom level block with J$,$ K$,$ and L$.$Which MBRs contain F and G$?$Which is the smallest MBR that contains F and G$?$

Ex: A$,$ B$,$ C

Ex: M