Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to gain badges in stack exchange [title] Familiarise yourself with the available types of badges. [step] [ ref [[/ref ] [substeps] Gold badges: these are the toughest to get and often reflect the length of time taken to secure them. They reflect important contributions that users have made, such as making a lot of good quality posts or doing editing work.

Ending1: They can cost a few hundred tokens by fighter, or can be expensive or rare to earn. Specialty badges: these are the hardest badges to acquire. Ending2: These are the best badges you can get. Bronze badges: these are easy to get. Ending3: Portable badges: like hat badges and basic badges, portable badges are more powerful and enable users to earn and trade more registrations at no cost. [title] Find the option where you can earn gold badges. Ending4: Elemental badges: these are especially hard to get by their very durability, but more than anything, reinforcement is often needed. Penalties may be ranged, with a fee of 5 points per badge.

Answer format: ending1/ending2/ending3/ending4