What technology was used in early digital computers for data storage?*Punch cardsHard disk drivesOptical disksMagnetic tape

To determine the technology used in early digital computers for data storage, let's analyze the options provided.

1. Punch Cards: These were widely used in early computing for data input and storage but were not the sole technology for data storage.
2. Hard Disk Drives: These emerged later in the evolution of computers and were not present in the earliest digital machines.
3. Optical Disks: These were developed much later and are not considered early technology.
4. Magnetic Tape: This was one of the primary means of data storage in early digital computers, allowing for the sequential storage of data.

Conclusion

The correct answer is Magnetic tape, as it was commonly used in early digital computers for data storage.