To solve this question, the user needs to have knowledge of VSAM files and how they are defined in JCL.
Option A: FILE INFILE FB(80 800)
This option represents a flat file. The FB indicates that the file is fixed blocked, and the numbers in the parentheses specify the record length (80) and the block size (800). This is not a VSAM file.
Option B: FILE INFILE VS
This option represents a VSAM file. The "VS" indicates that it is a VSAM file. However, this option is incomplete since it does not specify the file organization (KSDS, ESDS, or RRDS) and the access method (ESDS or RRDS).
Option C: FILE INFILE VB(100 504)
This option represents a variable blocked file. The VB indicates that the file is variable blocked, and the numbers in the parentheses specify the maximum record length (100) and the block size (504). This is not a VSAM file.