The Translation Loolk$-$aside buffer $($TLB$)$ is:

a$.$ a region of main memory dedicated to shared files or data buffers

b$.$ a high speed cache used to hold recently referenced page table entries

c$.$ a buffer that temporarily saves data in Direct Memory Access

d$.$ a buffer used by the operating system for translating system calls into O$.$S$.$ services

e$.$ a high speed buffer used to hold data recently received by the $\frac{1}{O}$ device