Which shift register has the property of entering the bits simultaneously

Which shift register has the property of entering the bits simultaneously into respective stages on parallel lines with parallel data inputs inspite of bit-by-bit basis on single line ?

a. Serial In Serial Out (SISO)
b. Serial In Parallel Out (SIPO)
c. Parallel In Serial Out (PISO)
d. Parallel In Parallel Out (PIPO)


Correct Answer : c. Parallel In Serial Out (PISO)

Explanation :

In PISO type of shift register, bits enter on parallel line basis with serial data inputs while mentioned shift registers differ according to their nomenclature.