4. Consider the following structural description. Check which blocks are digital systems. 51 S14 S4 $5 A B S6 $2 $3 C $7 $8 $12.c $12.b $12.a $10 $13.a $13.b S13 E F Seales/Signals $1 S2, S3 S4, S5 S6, S7 S8, S9, $10 $11.a, $11.b, S11.c, S12.a, $12.b, $12.c $13, S13.a, S13.b $14 S11.c S11.b S11.a 59 Tipo / Type Tensin / Voltage Tensin/Voltage Binario/Binary value Cifra decimal/Decimal digit Binario/Binary value Cifra decimal/Decimal digit Binario/Binary value Cifra decimal/Decimal digit Rango/Rang 0-0,4 mV 0-5 V {0,1} {0,1,2,3,4,5,6,7,8,9} {0,1} (0,1,2,3,4,5,6,7,8,9} {0,1} (0,1,2,3,4,5,6,7,8,9)