Step 1: Understanding the Provision.
Order V, Rule 20 of the Code of Civil Procedure (CPC) deals with substituted service of summons. This rule allows the court to order a substituted method of serving summons (such as by affixing a notice at the defendant's last known address, or publishing in newspapers) if the defendant cannot be served by normal means.
Step 2: Explanation of Other Options.
- (a) O.S. R.19A deals with the procedure for service in cases where the defendant is absent from India.
- (b) O.S. R.19 pertains to the general provisions related to service of summons but not specifically substituted service.
- (d) O.S. R.21 relates to the return of service but does not address substituted service.
Step 3: Conclusion.
O.S. R.20 is the correct provision for substituted service under the CPC.