Which two statements are true about extents?

An extent must reside entirely within a single data file because it is defined as a contiguous range of block addresses within one file; blocks cannot span across multiple data files.

Data blocks within an extent are assigned logically contiguous block numbers within a single data file, meaning Oracle treats them as a sequential range; however, the underlying storage layer may not place those blocks as physically contiguous sectors on disk.

When Oracle allocates an extent from a tablespace's free space, that space may have previously belonged to a dropped or truncated segment, so the blocks - while marked free - can still contain data written by a prior object.

Blocks in an extent are not automatically reclaimed for other objects; they remain allocated to the owning segment until the segment is explicitly dropped, truncated, or the extent is manually deallocated.